I just installed a blinker switch in my CJ when I installed my Painless wiring harness.
Remove the steering wheel to get to the steering wheel lock-plate. Then remove the lock-plate "keeper" with a lock-ring tool, I borrowed mine from Auto-Zone. Once you get the lock plate off, its just a matter of 3 machine screws and fishing the wiring harness down the column. If you have the part and the correct tools, it should take less than an hour.
It's worth the effort.