Ok so I've always paid a shop to replace my tires, and it's time my rear tire is replaced. I'm new to working on bikes (aka motostupid) and am learning as I go (now that I have the service manual I'm twice as dangerous!). How hard is it to remove the rear tire and is it possible to be done with standard tools? Or is this a precision job I should leave to a professional? It's $30 cheaper to mount a tire if I remove and install the tire myself first. Would doing this be worth saving the $30?