Dont use electric screwdrivers where metal screws go into plastic or nylon. The constant rotation will cause friction making the plastic soft and risk stripping out the threads. For e clips (Make sure you have a old white sheet spread out, easier to find e clips that like to take off)I use a small screwdriver from an eyeglass repair kit to pry them off the pin, if there is enough space I use small needle nose pliers to grab it and just pull it off. I personally dont like using a ratchet, when cranking down a nut its hard to really tell if it too tight and risk stripping the threads. For those areas I use nut drivers and small wrenches.