You could plug it in at the base of the column to test before changing it to see if this is even your problem
Definitely do this--no point in going through the replacement exercise if it's not the problem.
Look for Youtube videos on replacing a turn signal switch or disassembling the whole steering column to replace the steering sphere. I don't have the links on this PC, but there are some very good videos.
There are lots of little pieces in the column. The right tools as mentioned by others make it much easier. The thing is, if you're going to remove enough to do the turn signal switch,then you start to think about other things, like the sphere, upper bearing, maybe a new ignition switch...