First theme (2x):
B...3-5-3-1-3-3...3-5-3-1
G.....................................2-2

Climbiness:
e.........0-2-3...0-2-3-5...2-3-5-7...3-5-7-8...5-7-8-10-7-8......7........ .
B...3.................................................................. ..............10....8-10-7
G.......................................................................... ..............................7-7h9

Second bit (2x):
e...2-3-2-0-2-2...2-3-2-0
B.....................................1-1

The second 'climbing/descending' part is similar, I just haven't quite got it yet. The dTb song I really wish I knew is... well, I Wish I Knew. The main riff is just D-D-D#...E-E-F... play it in any position, couldn't be simpler. But it's the chords that really make the song for me, and I'm just about clueless.