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Fox has it right, remove the safety lever and the pin that mates it to the trigger. Pair of pliers on it and yank. It won't harm anything, but will GREATLY lighten up and smooth the trigger pull.
Avoid the PDI 300% spring, it is impossible to cock the gun (aka. have to put the muzzle on your foot, shoulder into the stock and reef on it) as well it'll end up destroying your gun (will ram the hop up unit hard each shot, forcing it forward and stripping out the securing screws). It'll also spit out BBs at over 550fps. If you want upwards of 500fps, go with a (First Factory) Laylax 150SP spring. It's very nice to cock and doesn't destroy the gun.
Best BBs are 0.29g SGM, or non-graphite/graphite washed off Straight 0.30g and 0.36g BBs. 0.43g are pretty heavy to use unless you are shooting 150ft away. Don't expect to get a lot of range out of them.
Hop up adjust screw allen key? Can't say, I've always just gone with the one that fits. Make sure you buy a set of long (as in ball end, about 5" long allen keys that fit into a screwdriver type handle) allen keys, they will make life a hell of a lot easier for you adjusting the hop up. Using a dinky little allen key will be frustrating for you.
Cocking it properly, total must! Grasp the cocking handle over the top, place your thumb on the handle boss (backside of the cylinder), rotate about 45deg, pull back then slide it forward. Don't ram it forward, you could damage the BB going into the chamber, and if no more BBs you'll screw up your mag follower, driving it into the fragile feed lips of the mag. If that happens, you'll be double loading BBs all the time.
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