Congrats on the purchase! I'm a HD mechanic by trade an can change 90% of the lugnuts I see with a 3/4" IR impact. My 1/2" will do a lot of it as well but its working its butt off. Make sure you have enough air compressor to run a gun that big as well.

For jackstands make sure to get small stubby ones that will slide under the axle, many HD jackstands are too tall to get under the axle.