It shouldn't be too hard. I haven't tried to do my Aerotank mega coil yet, but I've done quite a few for our Protank 2 tanks.
For me it was really easy if I wanted to end up using a 1.5 Ohm coil as that's what my PT2 rebuilt coils seem to always come out at for me. But I don't know about other people, but for me when I first started to use cotton for the wicks, I noticed a definite nasty taste to the vapor. Not burnt, not dry, just... something different and unpleasant to me. So, now I've gone back to just buying the coils at the local B&M's around here. On the other hand, my wife doesn't notice any difference so she uses all the rebuilt coils on her PT2 minis seemingly almost as fast as I rebuild them.