If you work carefully and deliberately it can be done, but it's not for everyone. If you want to be brave this Blog has a lot of tips on one page and includes procedures for CLAing a Compur shutter. You don't really need precision tools- just a lot of different jewelers screwdrivers. Do your best to not strip any screws and don't disassemble anything unless it's really needed- just take it one step at a time and don't go crazy and you'll be fine.