is there any way i can tune my own vtec?

Yes, you'll need a hondata ecu and a laptop. This will give you the ability to run different fuel maps, timing, etc. But nothing beats a good ol' fashion dyno tune.

no but you can adjust when it kicks in with a VTEC controller or get your ecu tuned

Cold air intake and a performance exhaust are easy tuning upgrades you could probably do.

if you have the tools and the know how, sure