Watch the Pivot Time online guitar lesson by Brad Carlton from Chord Studies: Jazz Turnarounds Vol. 4
Taking a look at this first chord here, the Fmaj7, you'll notice I hyperextend my middle finger and use the pinky instead of the typical barre. I do this so that I can keep the C and the A notes ringing throughout. Your first and third fingers will be guide fingers as you move to the ii chord, Gm7.