Fixing yourself

As long as you take it steady and have a box with compartments in for all the screws at different stages you should be all right.
This model has the older style wires with different size plugs so you really can't go wrong. I think it is only the screen and possibly the keypad that have ribbon strips to worry about.
There is very little in there really.
2 circuit boards, lens unit and flash unit.
borrow a camera and photograph each stage