It's easy and you can do it. The Air Injection removal is just that, you take off some parts and replace them with bolts and caps and that's it. If you can turn a wrench and use a pliers you're good to go.
In most cases you wouldn't have to rejet if you just replace the silencers and don't change the air filter but the pipes manufacturer will have the right info. You must ask before you buy so they'll be reminded to tell you. Again, it isn't that difficult if you're handy; if you're not handy ask for help here lots of folks on this board can give you great guidance.
