The only time I've heard of the tape method being used is when it's very loose, and it's difficult to pinch off, and you don't have tweezers. I've never used it myself.
I just bought some tweezers for whenever I get eyecap problems. Soak to loosen it up, then pull of with tweezers. It's pretty easy to do it yourself if you're confident you can control the snake's head from jerking around, but if you're not, perhaps you should have someone help by having them hold the body while you hold the head.
This may be pretty difficult to get, but perhaps getting a picture for us would help us identify it's indeed an eye cap. Sometimes when humidity is inadequate, their eyes will get dents in them, and these have been mistaken for eye caps in the past... If the snake is continuing to eat, just keep feeding til the next shed, and make sure you bump the humidity. I've done this for exceptionally difficult eye caps with no problem.