I'm going to jam with some friends tomorrow and I just got my new tubes in the mail. I don't think these tubes have been replaced in like 5 years, so I kind of want to retube it tonight. I have a Peavey Classic 50 and I want to know if all I have to do is unplug the old ones then plug in the new tubes? Should I wear rubber gloves or something as a precaution? I don't want to die!