Once your guitar is set up properly and you lock up at the headstock then you should never realy have to do too much tuning - only minor adjustments to the fine tuners. As far as using the trem system goes, there are a number of techniques but the ones that I get the best use out of are natural harmonic dives. You get these by placing your finger tip lightly on the string above the fretwire (not centre fret), picking then taking your finger off - just as you do for tuning up off the 5th and 7th fret harmonics. Try using the 3rd, 5th, 7th, 9th, 12th and same spacings on above to the 24th. You also get a really cool effect by picking two strings together, when you dive both go out of tune at different rates so the tone will 'warble' giving that screaming effect. Also, try picking an open low E string, then start the dive and after about dropping a semitone or tone, lightly touch the fret fret harmonic and keep on diving. This gives that really cool low end rumble to scream transition - great for ending a solo or song. THat's a fairly basic and easy but very entertaining into to using the whammy bar, actually dipping in and out of notes mid run is a lot more tricky. Given your difficulties, specialising in the whammy bar would help you to stand out and a lot players never use it. Hope that helps.