The saddling will be easy most likely, like timechaser said. The horse is use to all the extra stuff he has to wear. Just take it slow, start him out like a regular colt that has no riding training. Lots of walking and trotting in the beginning.
One big thing I tell people about standardbreds as I use to race them is to make sure when riding one that is green to riding, pulling on the bit constantly means to run faster to them and is not a sucessful way to get them to stop. If the horse takes off with you and you start pulling on the reins constantly then he will just run faster, instead give the cue to stop and if he continues to go, start circling and keep getting smaller in circles until it gets so small he has to stop. It does not take to long for them to get the point that a quick but firm tug on the reins means to stop not to run!
You know how to make a miniature horse even smaller? Leave them in the dryer a little longer!
"Don't ever regret something that once made you smile"