Like the other guys said, its easy, but you should have some specialty tools to do some measuring of your new parts to make sure that they are within spec. A small bore gage or set of pin gages would be nice, but a 1" micrometer, a v-block, and a dial indicator with mag base are all you really need for most simple rebuilds. (Other than basic hand tools and snap ring pliers)
Don't trust that your parts were manufactured in spec, measure that stuff! :thumbsup: