About movement for practising
When I began the watch repair courses I got myself a Nastrix pocket watch on eBay having a Unitas 6498 (inca bloc). Depending on the condition you can buy one of these for little money. Mine was new old stock, and I paid approx. $100 for it, but I wouldn't be surprised if you could get away with less depending on the condition. It was a very good practice movement as all parts are somewhat larger than in a wristwatch, and spare parts are easy to get.
Before this, I had been fiddling with my Vostok 24XX movements and was delighted to discover how easy it was to handle the inca bloc compared to the Vostok's. Generally, the spring is the only problem, but the advantage of the inca bloc is that it has a hinged spring so it won't ping but stay in the setting. Very convenient! Then again, when I serviced my first Poljot 2614.2H, it looked like it had an inca bloc, but I discovered the hard way it wasn't hinged and the spring pinged (my eagle eyes wife found it though, bless her). When I feel uncertain, I place a very small piece of Rodico on the spring (or hold it in place with some peg wood) before I try to remove it. That way it won't ping or ping too far.
Good luck!