Not having QR levers on the back wheel shouldn't make that much difference - it just means you need a spanner (wrench?) to undo the bolts instead - you don't need to take the bolts off completely.

Taking it off will be the easy part (like previously posted by velogirl) & putting it back on may be a fraction harder - untill you figure out how it sits in the detailleur thingy (probably the most daunting bit for you I guess).

When you put it back on it's just a matter of making sure you do the bolts back up evenly - hand tight & then take turns on either side untill they're tight enough. (basically saying don't tighten one side with all your might before doing the other side).

If you have a good bike shop to show you then that would be a good way to do it. Probably best that you do it yourself under their instruction - it's best way to learn. Otherwise if you can have a go yourself with someone on hand if you really get bamboozled then that wouldn't be a bad option either.

I remember trying to get a set of pedals off my bike (now I had done this before but it just wasn't budging) anyway a quck post on the forum asking which way I should be turning it to loosen and problem solved!