I commend you for realising you need help with your birds.I am in uk so cant recomend a trainer but what I can say is if you go down that road be carefull who you choose, Some are hopeless and do more harm than good.Read up some of Barbra heidenrichs books and internet sites, she is one of the best and uses positive reenforcement in her training methods .Dont go for any quick cure methods of training they dont work. From your post the problems sound deep routed and will take time and patiance any yes maybe the odd bite before they are resolved.
To me it sounds like you got bit and lost confidence,if thats the case you must sort this out as the birds will sence your fear and be scared themselves. Scooter sounds quite loving to me and I bet if you curb your fear he will be a right sweetheart.Please let us know what you decide to do.