Here is where to find the manual for your faucet. The only tools you should need are a pair of slip-joint pliars for the main ring and the hex key tool that came with the replacement parts. Remove the handle by loosening the hex screw on the underside. Make sure to turn off the water before you go any further and you will need to turn off both hot and cold.
Remove the dome-shaped cover either by hand or with some pliars.
Pull out the ball with the stem in it and underneath there will be two rubber washers with two springs underneath. Remove the washers and springs and put the new ones in. Put in the new stem (ball with stem) taking care to line up the slot in the side with the nub inside the base. Replace the round washer on top with the triangle hole in it and put the dome shaped cover back on.
Before turning the water on, use the back side of the hex-key tool to tighten the nylon ring that screws down into the dome shaped cover. Put the handle back on and try the faucet, if it moves too hard, loosen the nylon screw a bit, if too loose then tighten it. Once it "feels right" you can reattach the handle and turn the water back on.
I suggest turning on the water slowly and look for leaks. Not as difficult as it sounds.