yeah i would get him started over some poles first so he can learn to get his striding right, then when it comes to poles off the ground he will know when and where to take off a bit better. of course as the jumps get higher then the taking off point will alter, but horses are clever and he will learn fast. so do some trot poles, one stride per pole, then space then out again for his canter strides. shorten them up a little so then he can learn to get a good boucey, jumping canter. you say hes nearly 3, is he broken? if not then lunge him over some poles and small jumps.
Keep your feet on the ground when your head's in the clouds.