its not too bad as long as you take your time and pay attention to detail. buy a distributor wrench and find a black marker. leave your wires on your cap for reference, remove the cap but leave rotor. make a couple of reference marks so that yor timing wont be wwwwaaaaaaayyyyy out with the new one, once marks are made then remove the bolt and hold down at the base of the dizzy being careful not to drop them......kind of hard to get a grip as it is in a tight place. then if you havent already unplug the harness that comes out the side of the dizzy, grab the dizzy with both hands and pull up while giving it a few turns side to side. on new dizzy make marks in the same place as the old and this is the tricky part.......start sliding the new dizzy in, trying to keep the rotor lined up with your refence marks. make take you a few tries of reseting where the rotor is aiming as it will try to turn as the dizzy gears slides in to place with the cam gear. sometimes it will not want to easily fall into place but this is where the patience kicks in. you probalby wont get it perfectly lined up but as long as it is close then you shoudlnt have too bad a time tryin to get the timing back where it should be with a light after you are done.
replace cap and good to go, good idea would be to spend the extra to get new cap, rotor button, plugs, coil, and wires while you are at it as to make sure that it is all fresh and good to go, but if not in the budget then save for a later time.
if anyone can think of anything im forgetting please chime in as im on zero sleep right now and cant think of anything else.
