I'm sure I could do it... never tried. Did all of my own work on my car, just a little more nervous on two wheels. The following is what I'd like to do...
Change front Tire
Throttle squeaks a bit
Also wouldnt mind whatever else is involved in an "tune up"
Ok so far all those I would say do yourself, PC III there are some good guys in there that can help you with that.
Oil change as you know needs a filter change that too is pretty basic if you've worked on cars then this shoul be no sweat.
Check the length to make sure the next one is the same and while you're at is check the sprockets and replace those if need be, then install and check everything is good. A search in here will likely bring up all the 'how to's' yourd ever need.
Front tire, I personally remove my front wheel and by a new tire online and pay someone one to replace and balance. Or I get the garage I'm using to balance and fit to price match the tire I'm buying, the balance is important every time. Then I reinstall, which you'll want to read the how to to do this properly it's there trust me I've used it.
Squeaky throttle, I use oil in my cables to lube them. I basically just unscrew the throttle cover on the handle bar and gently let the oil go into the cables and twist the throttle to help it go down. I keep doing it till it's a much smoother action. Then reinstall, I'm sure if it's wrong someone will tell me on here. I'm assuming the cable is the squeak? If not the. Locate and either grease it it stop it from rubbing.
Good luck with it you'll be fine just go slow with here!