Doing a carb cleaning really isn't too difficult. I'm no expert... but I did have the carb off an XR200 last week, and I need to work on it more tomorrow, so I can try and give you a guide.
First, shut off the gas, and disconnect the fuel line, at the carberator. You might need some pliers to squeeze the little clamp... and a twisting motion usually brings the fuel line of the nipple, they can be quite tight. Then you will need to loosen the collar on the front of the carb (Back of the bike.) Loosen this almost all the way, it'll make it much easier to connect the airbox back up later. Unbolt the carberator from the manifold by removing the two nuts at the back of the carb. Easy the carb off the studs. Now unscrew the top of the carberator, right were the throttle cable goes in. Be careful, there is a compressed spring in here, so go easy. When you get this all the way off, gently pull out the needle and slide.
Now you have the carberator off the bike. Make sure the needle and slide arn't resting in an dirt, and go drain the carb. I just remove the big bolt right on the bottom, although there is a drain screw you can back out, the gas will run down the vent tube. Now you can remove the float bowl by removing the three screws on the underside of the carb. Don't loose the little plastic thingy in there, that goes back around the mainjet when you put it all back together. Now get your can of carb cleaner, and start spraying out all the passeges. A little compressed air can work good to help blow them out. Make sure you get everything, the main, the pilot, the two little air passes up front.
Now just put it back together in reverse order. Don't forget the little plastic thing around the main jet. You can't put it on wrong, its got a slot that it lines up on. One last thing to remember, is the slide only goes in one way. If you look down where the slide goes, you'll see the idle screw sticking out on one side, and a little metal post on the other. These have to line up with slide properly.
Its not really a tough job, don't be afraid to try and tackle it. Worst comes to worst, you'll just have to bring the mechanic the bike already disassembled.
One other thing... you can find a rough parts diagram at BIKEBANDIT.com. Wasn't that great of a quality, but might be useful. Good Luck!!! ;)