If you are reasonably competent with tools it is something you can do yourself. One thing you will need is a 1 7/8?(cant remember the exact size) deep socket to take the impeller off. You could probably rent one at a tool rental place or borrow one from a member of the boards.
If you want to know how to rebuild a jet I suggest buying the Selock jet pump repair manual. It will really help you through the process.
Jet Pump Repair Manual (http://rexmar.com/page126.html)