Hills are often easier the next time you ride the same climb. It's knowing what the hill is like, I guess.
I have a 34 front, 32 rear low gear. At 165 lbs, that's good for my local climbs. But my other bike has much lower gearing, and it's nice to stay seated on steeper climbs, and not be grinding a very low cadence.
I'd look for 1:1 ratio low gears if possible.

The Garmin 830 and 1030 and newer models have an elevation chart page. I can see the latest half mile of the ride, and the next 1.5 miles coming up. I like it, and that view stays on my screen in the hills.
That helps a lot with climbing: How much farther to the top? Is it a downhill next, or more rolling hills? Where's the steepest part of the climb? And, "oh good, flat roads for a while!"

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Ridewithgps
Sometimes rwgps has less accurate elevation data, so it won't always show the steep parts accurately. Sometimes, it shows the route dipping down into a creek valley that's actually crossed on a level bridge. But in general, it's good.

Car scouting:
I drove new routes sometimes, 15 or 20 years ago. The grade is difficult to feel while driving! I was surprised a few times when I rode the route.
You might take along your bike GPS, and see the grade% while you drive up the hills.