If you can gas weld, you can tig. The torch that provided the heat for tig is electric powered instead of gas powered.
Its easy!
Except I can't master it... I could gas weld just fine, but the tig I had the chance to use had the foot pedal. I'm was not corradiated enough to operate the torch with one hand, feed the rod in with the other, and operate the floor pedal as well. I could handle the two hand thing, but loose it with the foot pedal.
As I understand it, there are tig machines that do not have the floor pedal, but I have not had access to one of those, and my welding days are about done. My Miller mig and me got along very well.