An EMG is a test to check for nerve damage. They take a very thin needle and insert it into the muscle. While that sounds really freaky, it's not that bad.

It isn't put in very far at all. It's a bit uncomfortable but for me, wasn't that painful. Back then my legs jerked a lot, but during the test they didn't do it not once!

Later that day and for the next couple of days I felt pretty sore in every spot they had tested. The doc did my lower back and all the way down both my legs to my ankles.
Some people who've had it done will tell you how painful it is, how awful it was and will never have another. I don't blame them!!! LOL As with most things......having an EMG done is as individual as we are. We can give you our experiences and until the test begins there's no way for us to tell you which way you're going to go.....to the not painful way or omg that freakin hurts way. ROFL
The should do the test on the area around your knee where all the muscle is but not in the kneecap itself. You're not being a baby either! It's natural to get a little bit shaky inside and think up nightmares for yourself when you're having something done you've never had done before. I think you'll find it's nowhere near as bad as you thought it would be....at least I hope so!! I'll be rooting for you to have the better experience like I did. Take any pain meds right before going and have them with you just in case you might need them before getting home.
Hope it turns out really well for you and that the test is normal.
Hugs,
Karen