[quote name='merchant' post='522580' date='Jun 24 2009, 01:47 PM']I don't want to sound overly glum, and I'm all for putting oneself in testing situations, but I really really really would not play a 2 hour set having only just got a double bass.
Heck even at my peak I wouldn't play a 2 hour set.[/quote]
I've been playing DB for about 6 months and I've played a couple of gigs. But what I've done is bring the electric bass along, and as soon as I feel any tiredness at all in my left hand, switch straight over the the electric. From everything that I've read, you should never try and 'play through' the pain.
I'd imagine from the kind of music that you describe that there will be a lot of root-fifth type bass lines - what I find difficult about these kind of lines is the strain on my little finger having to repeatedly hold down the fifth. On BG, you you can use your third finger for this, but on DB your little finger will take the brunt so watch out for this. Anyway, hope this helps and enjoy the gigs!