if you don't have delay,practice your right arm to play fast and discontinued.
Edge has one of the best right arms in the world.
-all i want is you is pretty easy song and you need delay only if you're a perfectionist.
-sunday bloody sunday is also easy, the most complicated thing is solo which is moving up and down the fret on one string
-mothers of the disappeared is easy,all you have to do is learn it.
-desire was said
-all along the watchtower is three chords
-angel of harlem four chords(am-f-g-c and simple strumming)
-the first time acoustic is also easy,few chords(i didn't learn it cause i don't like the song)
-dirty day is great on acoustic(D-A-C-G all the time)
-staring at the sun and gone are 5-6 chords with few bass transitions
-stuck in a moment is easy,but you have to learn barre chords
-kite also(there's a B and C#m which are not too difficult)
next advice:
learn riffs from each song. you don't need to know every u2 song from begining to the end.
examples:
bad-even without a delay is easy
the fly-the easiest riff ever
i will follow, gloria, 40, discotheque, beautiful day, walk on, in a little while, new york...
you won't become something great if you learn fly riff,but at least your fingers will stretch and it will be easier for later learning.
haugh