I agree with Alwaysbehind.
I did train my young ones w/o a trainer but I also read books, watched DVD's, and asked for help. They are in my back yard so I was with them everyday. Start off with the basics. Keep your lessons short and always
end off on a good note. Teach him how to lead, back up, respect your space, lift his feet, groom, how to tye and how to stand still w/o tying. Be sure to spend undemanding quiet time. Where you go to his area and just "be". Don't pet him until he touches you first. There is so much that goes into training and tons of ground work that you can do before getting on his back. Remember, slow and steady wins the race. Good luck.