I found TherEx Notes (and the other clinical pocket guides) to be helpful.
We have this one and it's been fantastic! https://www.amazon.com/gp/product/B002YB0AHQ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
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The bag isn't great, but the table is. My wife's a PT and used it all through school. She currently uses it to treat me almost nightly. It's done hundreds of sessions and works very well. I'm using it to get through school now too.
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A treatment table is a great gift. There's no other good way to practice MSK stuff at home. Highly recommend.
Mechanics is everything. I'm a very large guy, but in my earlier days there were petite female PT's who could apply more pressure than I could. The fact that you're mentioning your skinny fingers tells me you haven't mastered your handling yet (which is totally fine). You shouldn't be relying on thumbs and fingers for a lot of techniques - your elbows and knuckles are your friend.
Also, just a recommendation, I started to have thumb issues pretty early into my career, so I got one of those "thumb saver" things that RMTs use, usually for STR techniques. It is amazing the amount of leverage you can get when using what is essentially a stiff thumb with a handle. You can drive your entire bodyweight through it and it will feel way easier than putting 1/10th of the pressure through your thumb.
This has all special tests for each region of the body. Along with most tests you will use in an eval
https://www.amazon.com/Physical-Therapy-Quick-Study-Academic/dp/1423203151
Great study tool and useful at all stages, even clinical, as a reference tool
This foldable clipboard is specific for physical therapy and has a lot of useful quick reference info that we normally use.