Good quality tools are definately a must. I had a cheap socket set and it actually snapped when I was trying to take the standard BOV off to install my new one
Went round to my parents place and used my Dads tools and was all done quick smart as he has everything under the sun as he used to do up cars for a living many years ago.
And in regards to doing things yourself, always keep it in mind. I just blew $250 in labour costs for fitting and setup of coil over shocks. It was so poorly done that I took the car apart, pulled them out reset them and remounted them myself. Took a few hours but at the end I had a perfect result and could have saved $250, or bought a whole lot of beer
I have never been particularly handy with cars but since I have had my skyline I have changed my own brake pads, changed my own shock absorbers (several times, don't ask!), installed an aftermarket BOV, plumbed in, mounted and connected a boost gauge, installed a boost controller and removed the factory boost solenoid and cleaned up a lot of loose and poor quality wiring in the car.
It gets easier the more you fiddle with things and it does save you a lot of money as I was quoted $50 to install the boost gauge, similar for the boost controller and a lot more the shocks which I should have saved too!! It all adds up!