as my coach says- the way to learn to climb is to climb and figiure out what works for you. Having said that I will add that shifting down into an easier gear at the bottom and chicken legging (spinning) up the first part of the hill seems to work for me. I tend to leave myself as many easier gears to down shift into as possible and will shift down as soon as it becomes apparent that I will need to. Ialso prefer to climb seated. Just remember to sit up straight, release the death grip on the handlebars, open your shoulders, breath deeply and relax your face- it really makes a difference. In spite of the fact that you are trying to keep up with a group ride, remember the top of the hill will still be there whenever you reach it and that there is rarely a hill that you can't walk up.
marni
Katy, Texas
Trek Madone 6.5- "Red"
Trek Pilot 5.2- " Bebe"
"easily outrun by a chihuahua."