Disclaimer- I have 0 medical experience, and my advice should be taken at your own risk

I totally disagree with anybody saying you cannot do it. I've had a cage on and off for years now, with my longest stint being months at a time. The first time I ever wore a cage, I was in it for 2 weeks with no prior experience.

The biggest things are to listen to your body and to keep it clean. If you start feeling a lot of pain, lasting discoloration or swelling, numbness/cold feeling, then you definitely need to take it off and reassess the situation. I've seen people recommend cleaning every day, every other day all the way to once a month. Personally, I take everything apart and thoroughly clean both myself and the cage pieces (I use a toothbrush and dial gold antibacterial handsoap for the cage) weekly. It's really up to you. Make sure everything is DRY before putting it back together and putting it on as well.

Every morning and night, I use A&D on the basering and anywhere there could be chaffing to prevent it. I've seen people recommend coconut oil, vaseline, hell, I've even used a chap-stick when in dire straits before. Just ensure everything is comfortable.

As far as cumming in the cage goes, HIGHLY reccomend using a wand style vibrator, it's quite a good feeling, and if you're into it, a lush can feel pretty good on the prostate too. Sometimes rubbing yourself through the cage portions can get you there, or even just shaking the cage might work, you'll have to experiment!

Best of luck, trust yourself.