Is it possible to avoid anaerobic 'burn' on ascents?
Get an app like strava to log your rides, and see your progress on those climbs.

I have a climb near home which took three hours first time I did it.  I rested a bunch of times on the way up, and got passed by dozens of riders.   

Over the last three years I've improved to the point I can do the climb in 40 minutes non-stop, still get passed but I'm passing others, some of whom look shattered.

Remember it never gets easier, you just go faster.  Some logging will help show you your improvements, because it never feels faster at the time.