Even if you don't climb poles there will still be ladder work.
When I started if you couldn't climb a pole satisfactorily then they didn't keep you on. (This may have changed I guess.)
The first pole I climbed was on the snowy training field in Croyden TEC. Keen to get it over with, and show off a tad to the others and a handful of existing frames staff being taught to climb, I volunteered to be one of the first pair up. Having successfully reached the working steps and put the pole belt round (we 'free climbed to the top then, no fall arrest lanyard) the trainer shouted up to lean back into the belt, hands free, and make ourselves comfy for ten minutes, I rolled a fag ....
If you can't do heights is this really a role for you ?