Inflate the sponsons first, wet the base/hull a bit for lubrication(i allways found it easier for the airdeck to settle properly when wet inside) then lay the airdeck in and loosely strap it in so the straps are only just through the buckles by about 2 inches, fully inflate one side of the air deck, then fully inflate the other side, when it starts to take shape, pick the bow up and shake it about a bit - keep doing this untill its fully inflated, then pull the straps up till they stop-not too tight though.
I dont think this method is in the manual, but i allways found it to be the best way.
If you havnt allready got one-i highly reccomend the the Bravo 12bst hp inflator pump-its the only 12v pump that will inflate the floor to max pressure-and very quickly too,well worth the money- heres a link
http://www.force4.co.uk/ProductDetai...productID/4526