I got the bright idea that I would "fine tune' the front derailleur on my wife's Haro Vector mountain bike. Alas I am apparently not naturally gifted at this task. If someone could please instruct me on the proper way to get this back to functioning, I would greatly appreciate it. I've managed to get it to skip from small to large sprocket and completely skip the middle. It has index shifting and I am woefully out of my league. I'd like to safe the 50 bucks at the bike shop and consider myself mechanically inclined but I am clearly missing a nuance somewhere.