SummitXods for small begginer rider

I am a first year sledder who just bought a REV-XP SummitX 146. I have only spent one day on a snowmobile in my life before I bought this, I have two days of mellow trail rides on this thing.... 50 miles. I have however been riding quads/motocross for 8 or 10 years as well as snowboarding for 15 years, so I have some snow/ extreme sports expierience. The one day I spent on rental sleds was on 03 Arctic Cats in 3-4 ft fresh pow. I struggled greatly carving the Cats, I mean i could not get them on edge period! Keep in mind I am 5ft7in, 135-145 pound depending on gear. I bought this XP because it was the lightest mountain sled avaialable, figured it would be easier to carve/throw around. So far from dipping off of the trail a bit on my two break in rides, I am dissapointed. I am wondering what mods I can do to make this thing easeir to handle/carve in the pow, I am not very concerned with trail handling. I am willing to spend up to 2k making this sled what I want, I just want to be able to throw around the end product a little better; I no I need to learn how to ride.... that of couse will help. Thanks for the input.

I think alot of you misunderstood me...., I dont expect to become an expert in a weekend. I was just wondering if there was anything smaller guys were doing to there sleds to make them easeir to handle...., as in easier to learn. I have no problem spending the time to learn how to ride; I would just like to no anything guy's are doing to these sleds to make them a handle a little better than stock. I know from motocross that new machines are rarely "buy and go", so what are guy's with these sleds doing to them? Thanks.