Alpine boots are fine for the up hill skin, as you don't need the rearward motion when climbing. It is on the traverses that the hinge mechanism of AT boots really makes a difference. Flats are not fun in alpine boots. Soooooo.....just skin up, not across. ;-)
As for early season skiing, just bear in mind there are more terrain issues when skiing early snow. Because there is no real snowpack to cover minor terrain changes, rocks, twigs, roots, vines, etc, it is much easier to get snagged on something hiding just below the snow. It is not uncommon for experienced backcountry skiers to end a season in November thanks to a root or branch hiding just below the surface. Stick to trails early season, where you are less likely to encounter deadfall or other obstacles, as the trails are cleared more regularly. Go with people, preferably more experienced than you, and always carry appropriate gear to let you survive the night if you got stuck (some basics are a space blanket or contractor bag, long-burn candle, fire-starting supplies, ample water and some light food, and a headlamp or flashlight).
Learn by doing with experienced people. No amount of internet forum wisdom can substitute for that.