Joclyn, large
rose bushes (which it sounds like you're dealing with) are pretty tough, & you can prune the dickens out of them & they'll love you for it! The most important thing to remember while pruning
roses is that you want to leave the center pretty well opened up, so they'll get good air circulation & light. Overcrowding branches, which happens most often in the middle of
rose bushes, invites powdery mildew & other diseases.
When trying to decide which branches to trim, notice which way the new buds are facing. You'll want to keep only a limited amount of the branches (or portions of branches) with new buds that will end up in the center of the bush, once they leaf out & have gotten longer.
Different types of
roses grow at different rates. Knowing the type of
rose you're dealing with helps to determine how far back you can cut them & still have a full, nicely shaped bush when it blooms. Your pruning & shaping should be appropriate to the type. (For example, Climbing
roses need very little pruning... mainly just "cleaning it up" & snipping off the dead stuff that didn't make it through the winter, while the Floribunda types like to be cut back & have fewer branches than you might think... & will also produce more
roses!)
When I prune my Floribundas, I begin by cutting them quite a bit shorter than I want the bush to be when it blooms, because I know that it'll take off & be taller than I intended, if I don't!
I never let branches lean on each other, & I cut one off if it looks like it will cross over another one later on, when it gets longer (in the best interest of light & air circulation). I also cut all branches back that have buds facing the house ...my bushes are relatively close to the house, & I don't want them to touch the building later on. (That just gives access for bugs & spiders to get inside, through the vents under the eves!)
When cutting any part off a
rose bush, be sure to cut at an angle. This allows moisture to run off, rather than being trapped on a flat cut. Although I've never done it before, a Master Gardener told me recently to put a dab of Wood Glue (it's more water resistant than white glue) on the ends of the larger branches that I cut. He said that it seals the "wound", making the
plant less susceptible to disease & insects that may otherwise be attracted to the fresh cut.
The only other thing I can think of right now, is that after I first "shorten" the bush, the second thing I do is to focus on the base & whack off any old, woody branches. This encourages the
plant to use its energy for the newer healthier growth coming on this year, & will make for more blossoms.
I hope this helps you decide what you want to do. I say
be ruthless with your pruning & don't worry about damaging them... If they're as prolific as you say, they'll grow back with a vengeance & you'll be very happy! As Terry & flwrgrdnmom mentioned, protecting them during this weird winter weather the whole country has been having this year, isn't a bad idea at all!
Happy gardening, & I hope you have beautiful
roses this year! (Maybe you can post some pictures of them here, later on!)