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Yes can be done at home but you should have a gage that goes to 200 psi so you can check pressures. It's like trying to time a motor with no timing light. The advantage of the injection shop is they can spin it up. If they will tweek it would be nice but some just set it to the code for that...

Yes and the throttle center screw does too. The best performance as said to do. Duel fuel line, shim the rpm up to around 2350 and decrease the idle plunger number and adjust the throttle shaft center screw. I myself would stay below 200psi rail pressure and as said pyro.