I started ground work, trailer loading and giving her feet when I got her as a yearling. Worked her for the next year on ground work and took her for walks down thru the creek bottoms, pastures and woods and she loved it crossing downed timber and the creek every time. Also I had a good obstacle coarse in the pen with logs, plastic tarp, wooden pallet bridge and a bale ring walk thru. It really helped her when the vet ok'd her joints for riding. She'd seen a lot of things by then. The last couple months before she turned 2 I introduced the saddle to her and ground worked her in it. Started with a real light kids saddle but, it let her get used to something being on her back and being cinched. Her joints didn't close up until she was 2 years and 3 months. Then I started riding her. She was a big 2 yo at almost 15 H and #1,000. She has been a real good young horse so far and I attribute that to all the handling she had before riding. It's been a fun time. Good luck with yours , it will be fun!