Congrats on the new (to you) bike. They are a fantastic ride.

Others may disagree, but there really are no special gymnastics required. Drain, swap filters, refill with 4 qts and ride. If there are a few ounces left in there, or if you're an ounce or two high or low on the dipstick, no worries, right? The ole gal will never know the difference. She'll just be happy to be out riding, after averaging 575 miles a year all her life. Congrats again, sir.