You definitely picked a nice airplane to build. I'd recomend starting out with something else your first time though. Even if your flying skills are very advanced you might consider starting with a more basic kit like a trainer, Sig 4-Star, Sig Somthin Extra, Goldber Tiger, etc. for a first kit. You can cut your teeth on these and learn all of the little tricks, frustrations and solutions of building.

The Mustang, while a well engineered, straight forward building kit, is still more of an advanced build. That's not to say you can't do it of course. If someone is mechanically inclined, has some decent wood working skills, is meticulous, patient, knows where to go for help, etc. they could probably pull it off.