I've shot tons of commercials. It all depends on what you want to get involved with as to if it's difficult or not and what equipment to use. I've shot spots ranging from 1 hour shoots, to 5 day shoots. I've used my GL2 and DVX100a up to renting a DVCAM. It all depends they can be as difficult or as easy as you make it. If it's your first time I wouldn't jump into a huge account, you kind of need to start small or at least have an experienced producer by your side helping. Otherwise you might bite off more than you can chew and word about unproffesionalism gets out fast. Good luck in what you decide.