HI Addi,
The plugs do work really well for most people. They are not hard to insert, and "technically" the patient doesn't feel much of anything, except for some pressure, as Lu mentioned. Occasionally the patient has to take a bit of valuim if the nerves are to great, but otherwise it is not a big deal. (easier said that done, since I have never had it done, but have assisted the doc a number of times.)
Did you get some prism glasses? I hope they help your double vision.