The main problem with difficult re-assembly of the old style Ruger Mk pistols, is instructions like: turn it upside-down, hold the trigger, tilt it forward, insert this, tilt it back, lock the piece...
If people don't know *why* they're doing these steps, it will always be a mysterious chore. If they understand that they're moving the hammer, tipping its swivelling strut onto the bearing for the main spring which is compressed in the removable back strap, and relate it to the pieces and their relative positions as they see when the pistol is apart, most would only have to look at a tutorial video the first time.
You meet lots of Mk shooters at the range. If anyone expresses fear of taking it down to clean, I can very quickly (with their permission) take it apart, explain those bits, and have it back together. The response is 'that wasn't as bad as I was told by everybody .' [New pistols are a little tight to work with, I'll admit.]