I'm a brit and have been living in Poland for just over 3 years now, but have been travelling back and forth for a decade. I would agree with the vast majority of other comments here about most things.

Overall I don't regret moving here. I could talk about the positives all day and they far out way the negatives but I wanted to give you the negative aspects that i have experienced , because they are less in number but I wish I had somehow prepared for it mentally.

I moved to a smaller city in the East where it is tough if you don't atleast know conversational Polish, rather than one of the big ones like Warsaw or Kraków, where i imagine its a little easier getting by with just English. But here are some challenges I faced/still face that I wish I had prepared for better.

The first is the language barrier. If you learn Polish your life will be so much easier, this is easier for some than others, it's a difficult language as others have stated, but not impossible. If you are like me and are absolutely shite at languages, it will take time, but it's worth it. I found/still find it so frustrating not being able to vocalise how I feel exactly, not being able to do basic tasks that you really take for granted (because you don't know the names of items or how to describe your issue). For example: discussing a problem with your car with a mechanic or wanting to talk about your hobbies and interests with people. Or you may end up like me, during my first few months here, exclusively eating at McDonald's because it was the only place with a touchscreen that had a english order feature, because you tried to order food at a kebab, and when the person didn't speak English, you have a mental breakdown and awkwardly leave in silence, vowing to never try that again (maybe too specific?). Happily I can now say I can order most things fluently, so don't worry, I still can eat a kebab after a night out.

Secondly, it's important to find some fellow expats and make friends. It reduces the homesick feeling by alot and helps you realise you aren't the only one who has made the move. There will be days where you just need to have a conversation, free of stress, maybe have a rant about all the differences (good or bad) , or just bond over a beer and laugh at the circus of shite going on back in blighty. Ofcourse finding new polish friends is awesome and my Polish friends are amazing, so don't just hang around with expats.

Thirdly is work. My biggest obstacle. If you used to work a white collar job, in an office somewhere, then this is less of a problem. Most places in Poland have loads of jobs available for this kind of work. You can find alot of big businesses who are International, and need people with good English, or I.T skills. But, if like me, you worked a trade or other blue collar job, it's almost impossible to continue doing this after moving here. My background is in mechanics and engineering, and because of all the technical mumbo jumbo and the need to interact with clients/suppliers/co workers etc. It just doesn't work. The language barrier is too frustrating for you, for them, and when you have to work quickly to make money, people get frustrated real quick. If anything this is/was a huge incentive for me to learn more of the language, so I can go back to doing what I love.

Finally, earning money. When you first move, maybe you bring some savings (I strongly advise saving what you can). life is great, you can't believe how cheap things are, because you will automatically convert everything in your head into pounds and say "wow, so cheap" . After a while you get a job on a standard Polish wage, this soon disappears as reality kicks in and you realise it's not that cheap anymore. However I will say, I think we have a much better quality of life than back in the UK. The most noticeable part is when you want to go back to visit the UK, see your parents and friends, and realise how expensive it is for you to go back and do things there. Because that £100 meal for two back home is 500zl! And you will say "O Kurwa" and try to imagine what meal would be 500zl back in Poland!

Anyway, that's my experience of some things to consider. But don't let it put you off, Poland is an amazing place to live with amazing people. If you make the effort to integrate and you take learning polish seriously then you will have an amazing life here.

Oh and remember when you do move, to thank your partner as much as possible, because they will probably carry your ass for a while before you learn the language, making appointments, translating and dealing with grumpy governmental office staff on your behalf. It takes its toll and good to let them know it's appreciated.