I recently obtained a Promethean ActivBoard Fixed System (with projector), and I'm wondering if people think that a Certified installer is necessary, or if I should try to do it myself (with help from a friend)? It's the large one (595 = 95 inch?). My concern is that certified installation will cost 500-1000. The board itself cost 8000+700 shipping. I don't have the money for a certified installation, so it'll have to be delayed for donation requests ($). Thanks for your feedback!