34front 25rear is IMO a small gear (its lower than the gears on my road bikes), before you go any expense I would give it a while for you too build up your fitness. The steepest my compact (a 36 front 25 rear) has been up is a 26% and my other bike (a38 front 25 rear) the steepest it has been up 21% and you'll get a lot of folk who'll go up steeper with an even higher gear.
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What distance at 20+%?
I have a 90% step outside my house...no problem.
But I have trouble doing a 14%(I am sure it is steeper!
) for just under a mile on the 34x25 cogs.