This is how a over 50 guy would do it. Put a shift light in it and once you release the clutch on launch preload the shifter like you are trying to make your shift to second. Don't worry as long as you are on the gas you will not pull it out of gear. When the light flashes tap the clutch, not a full blown to the floor petal mash, but enough to take the load off the drive train which will put you near instantly into second. Repeat for third and fourth keeping the throttle floored this whole process. This along with figuring how many rpm you need on the launch to keep the car from bogging will go along way toward making your GTX perform to its best. Practice, practice, practice and don't be afraid to tear it up, it can be fixed.