It's a one person job. However to wrap a full vehicle in a color change, you need tons, and tons of practice. Something flat wont be too tricky, but you'll probably waste as much material trying to wrap a bumper perfectly as you would doing the rest of the vehicle... It's not something you should try if you have no experience wrapping. Not to mention even if you do get it looking good... If you dont know the do's and don'ts of wrapping, odds are it's going to start peeling and falling off within a few months and look like crap anyways.
That said... you need to start somewhere, and your vehicle / family vehicles are the best place. just know that it wont look perfect.
AND if the paint job is shit... IE peeling or not smooth or tons of deep scratches... just know that will all show through. Unless you spend days sanding the vehicle down.
In short... Doing a wrap isnt hard, doing a proper wrap is... If it were me and I wasnt in the wrap business, I'd tell him to go somewhere else...