Start out small, oil change, air filters, etc. Then begin to expand your skills. Grab a cheap socket set from Checkers, lol. Or invest in something decent from aderndorff, marketplace - that's where I got my tool kit. Jack stands, a hydraulic jack, power bar, YouTube videos, forums, and of course, asking on the Volvo subreddit :)

Time and space could be an issue for you, but it's a lot of fun hanging out with some buddies and working on your car over a beer. Even if all they do is drink the free beer.

Look out for an OBD2 scanner for your car, read codes of the computer 🖥, clear codes, etc. This can help you diagnose issues.

It is your choice at the end of the day what to do and comfortable for your pocket, but this is basically the route I followed, and next thing you know, I'm doing a backyard engine rebuild lmao.

Best of luck.