To learn Def Leppard - Foolin chords, your first step should be understanding these chords - Am, F, D, Dm, C, D, Bb, D, G, F, A and F in sequence. For a smooth transition, initiate your practice at 56 BPM and gradually match the song's pace of 114 BPM. Considering the song's key of C Major, position your capo to suit your vocal and chord preferences.