A speed wrench is very useful removing and installing pieces with multiple screws like primary and cam covers.
It cuts the time to remove the screws down drastically.

Speed Wrench 1)

Socket wrench extensions and adapters come in many sizes and aren't expensive.
Extensions can be doubled up for extra length in tight places. Add as many as you need. Good to stock up on.
Socket adapters allow you to use different drive wrenches on one socket.

Socket extensions and adapters. 2)