Man, save yourself some money. I think if you're at the stage where you're playing Jems, you can set up a tremolo. There's no witchcraft to it, the whole thing makes sense. I know that from my own experience it's very good for you to work through a tutorial yourself; along the way you realise how it works, and that means next time you have to make a smaller adjustment you understand what has to be done and why. There's no prob messing up your intonation either, to fix that you need a tuner, at least one working eye, and about two lines of text in a tutorial file. Done!
I don't mean any of that to sound condescending if it does, for example I know nothing about the electronics of guitars, but I've never had to... yet. This trem stuff though, it's basic setup stuff, pretty essential, and it will save your cash!
