I'm thinking about modding my Limited. So far, the only "mods" I've done are K&N oil and air filters. I just ordered the Eurocharged tune.

I have very little mechanical experience. I've changed my own oil and installed custom wheels but I've never taken an engine apart or anything like that. However, I'm eager to learn and would like to do some of my own work. So, I have some questions:

1. Which performance mods are good starter projects for modding newbies? Is a CAI easy to do?
2. If I do a CAI, would it also make sense to upgrade the injectors and plugs at the same time? I imagine more air will require more fuel to make more power so ignition system upgrades would be a good complement to a CAI. True or false?
3. After a CAI and injector upgrade, will I need a new tune or will the computer figure it all out on its own?

Thanks.