IMO, a thorough AND inspection of the movememnts components requires disassembly. If the movement is rather common, then (regrettably) ebay may provide you with a replacement, parts, or practice movement at little expense. For example, the Bulova rectangular 7ak is a nice movement and perhaps should not serve as a practice/learning movement; whereas the 8bc(?) is relatively common and easily sourced. May I suggest that prior to doing anything, perform a web search for watch cleaning- there's a load of information out there. goodluck
p.s. in the spirit of the boards, dont forget that hardcopy, manual resource- a good book.