As a novice rider, I am curious as to how much experience is needed to be able to safely handle a 600 REV HO? Most of my riding will be on groomed trails in New England for upwards of 100-200 miles per day. Is time on the sled measured in miles or what is the standard for graduating to an intermediate? Want to keep myself and other sledders out of trouble. I am starting with a 1997 MXZ 583. All opinions valued.