A KLR is simple as a tractor. The doohicky is easy to do if not already done. And, I have the tools required (and are willing to loan them to you - they are for a 2nd gen KLR, but I am pretty sure the tools are the same for both generations).
Get the doohicky and torsional spring from Eagle Mike. Accept no substitutes.
There are lots of places for parts, accessories, and farkles. In general, they are relatively inexpensive also.
The KLR is a fun, reliable, pack mule of a bike. You will like it. Although, you will have to get thick skin for the ridicule about being cheap.
Get a milk crate for the back.
RR