I've never opened up either of those cameras, but generally you need some jewelers screwdrivers
I'll snip jim10219s post there, although the rest of it gives some great advice. Mine is as follows:
Beware of cheap tools! Cheap screwdrivers can easily break and damage tiny screw heads. For instance, look for good quality screwdrivers such as Bergeon, although my set of 9 student quality ones set me back over £100! Most watchmakers tools are properly pricey, but are very well made and will last if they are looked after. A good set of tweezers is also a must, you want a set that can grip the tiniest screws without pinging them off into the unknown! I do have a few cheap tools which are good such as my Neewer lens tool. This is 2 blades and 2 points which makes an adjustable frame. Good for unscrewing lenses and some wind on levers on certain cameras.
For a work space, I use an old white coated chipboard desk with raised legs so it's at almost shoulder height when I'm sat down. I've attached sides on it too. Googlise watchmakers work area for some more ideas.
35mm film pots and plastic takeaway trays with lids are so very useful for keeping various parts and screws.
Get a good magnifying lamp. And a couple of Ikea clip on lights too. The more light and magnification you can use, the better!
Start by rebuilding a lens or 3. Then up your game by finding a few old faulty Russian cameras. Zenit 11, Zorki, Kiev, or an old Praktica. Solid old cameras that are made using quite basic engineering, plus there is a wealth of info on repairing these online, and they are worth next to nothing if it all goes wrong!
I occasionally repair clocks. I occasionally rebuild engines. I also used to restore vintage tube amps, which is electronics not mechanical devices, but still, it can be learnt!