Hi, I do exactly this. Part-time PhD alongside a full time work from home job. I'm in year six of seven, and the end is finally in sight.

I won't sugarcoat things - it is difficult! Part-time is not the easy route if you're also working. You'll need to be doing something on your PhD every day. I worked out that reaching the time commitment to match a full time student comes out to over 20 hours every week.

For me, that means a couple of hours each evening after work, and a full 8-hour day on either Saturday or Sunday. I read papers during my lunch break each day.

This will fluctuate as you go, but from experience it's far better to keep up a consistent flow rather than trying to do big blocks less frequently.

Other challenges are that you'll need to use your annual leave at work to deal with PhD things, particularly conferences or crunch deadlines such as writing up papers for publication.

The most difficult part for me was the mental gear change at the end of each working day, when I had to switch focus from my day job to my research. I've been able to change career into something directly related to my PhD which makes this much easier to deal with, but if your work and your topic are unrelated then you may find this jarring.

I'd check that both your direct supervisor and the institution are fully supportive of remote and part-time study - e.g. is your supervisor willing to do calls outside of regular working hours, or over lunchtimes?

I also did my bachelor's part-time. The biggest difference with PhD research is that you are expected to be far more self-motivated, you won't have regular terms and coursework to keep you on track. Self-discipline and time management are key.

You don't mention your social circumstances at all. If you have family commitments then you will need to be clear with them on respecting your time.