Im ready to buy a tuner

[superdav]

Ive got my 6.0 and 4l80 for my swap and I want to tune myself.
I don't care about bells and whistles I just want something that tunes my swap motor/trans for my 84
The only laptop I have is a MacBook and I'm not buying a windows laptop just for this but I do have a windows desktop that I never use and would dedicate that to the tuner if I need a PC

Can I do this effectively without a PC?
Which one is the best for a budget?
Do they do the TCM too or is that separate?
The reason I ask is because donor is a Yukon that can still be driven, do I need to plug it in and get the info before doing anything? Or can I just wait until the swap is done to worry about the tune?
Regardless I'm kinda anxious to get a new toy