yup you've got the nack for it! for "what if" you might want to try the interlude that involves 2 strings...
----5--6-----9--8-----5-----9--8------3---5----8---6--|
-0---------0--------0-----0--------0---------------------|
the key to getting any song right is to keep practising....listen to the song, memorise where everything goes, practise putting the fingers in place, then combine it with the picking...
yes it is possible to go fast enough for Bullets, i've heard of accounts where they play it too fast! the key to bullets is to alternate pick....but just practise some more before you get into their faster stuff
cheers!