Need advice!!!

90cm really isnt a good idea for someone whose barely jumped, you dont want to ruin your confidence! 60 cm or the cross pole class would be loads better for you by the sounds of it, jumping a course under the pressure of competition really isnt as easy as it sounds...good luck in whatever you decide to do, wait a while and spend the money on really good training and maybe a share horse to gain experience, THEN buy a horse.
 
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