So much of it is a mind game. which is why you shouldn't get too caught up in the mapmyride/GPS info. Don't get me wrong it's useful but it can be counterproductive to obsess on it.

I have a really good friend who we have now dubbed "Old Fearing Hills" after a road we saw on a ride once called, "Old Fearing Hill Road" this guy is actually a really good rider but he gets totally psyched out by hills. If he knows there's going to be a long climb on a road ride or tour he starts talking about it the night before. He'll know from his Garmin exactly when we're approaching it, when he sees it he'll start to slow down, say stuff like, "Go on ahead. I'll see you at the top." A little part of him gives up, and off the rest of us will go. Once we're out of sight he climbs really well and when he gets to the top he's in great shape but he'll repeat this routine with every hill.

Over time you'll learn how to "attack" these hills. Maybe some of them will need an immediate shift down into a considerably lower gear, others may need a more gradual change of gears. Occasionally you may want to stand, though I recommend getting used to doing them seated, especially for a commute- its not a race (unless you want it to be).

The main thing is to keep your knees from suffering. Know the difference between "good" pain and "bad" pain. If you're suffering with muscle fatigue that may not be so bad and may be a necessary part of getting stronger but beware of knee pain especially if accompanied by swelling. This is why bike fit and shoe/cleat fit are so important. And also why it's important to "spin" up them (another reason why I don't recommend standing- riders tend to grind their way up standing and it can be really bad for your knees.)

Have fun! I get a great vista at the top of my climb and it makes it all worth while, hopefully, you get some rewards from all the work!