If you will wait till after dark and your hens go to roost it will be no trouble at all to catch or get your hands on your birds. Just move slowly, and put one hand under each birds' breast or keel bone, palm side up and the other hand on the hens' back palm side down and you can pick them up as easy as pie. Remember the less light you use and the less and commotion going on the easier it is for you and the easier it is on your birds. If they object to being picked up like this use my alternative method.
The alternative method is to gently put one hand on each wing and using no more force than necessary firmly pen both wings to the chickens body as you lift it from the roost, keeping your thumbs on the hens' back and controlling its drumsticks with the finger tips of both hands.
If you are right handed cradle the bird in the crook of your left arm with its head pointing towards your left side and with the chickens' left side resting on your forearm, and its back held firmly against you belly, then grip its feet (what some call its legs) in your left hand. With your right hand spread the right wing out and transfer your grip on the wing from your right hand to your left hand
yes you can do it it just may take a little practice. Use your right hand to operate the scissors while your left thumb and fore finger holds the wing spread out like a hand of playing cards. You can even use the left hand to insure that you don't nip the wing tip.
Do yourself a favor, if you have a bunch of birds to clip, get a GOOD pair of scissors like CaseXX scissors that have a serrated blade or edge and that both halves of the scissors comes apart without tools for easy and complete cleaning or sterilization. If you care for them these scissors will last for a 100 years or longer and they are also handy for butchering chickens, for dubbing hens and roosters or for performing autopsies or you can put them to a 101 uses in the kitchen.
Do remember that after the molt is over you will have to do it all over again.