Well .... you may know what you're doing, but if something may happen to come loose, like a crank bolt or pedal thread that you may have skipped then claiming warranty on that crank or pedal that just happened to fall off as you were 'just riding along' can be a bit more complicated. I'd recommend taking your new bike back for that initial tune up so you can point the finger at the bikeshop if some part of your bike fails .... get a receipt for the service too. You never know!