Hi. Don't stress to much about it. You've obviously had a lot on your mind.
First thing when it comes to handling chickens is that you have to exude the air of confidence (even if you don't feel it!). Handle the birds deftly and firmly. They will struggle less than if you are trying to be too gentle with them (obviously I'm not saying strangle them or squeeze them to death or anything!).
Some birds are naturally more stand-offish than others, so it could just be their personalities about not being overly friendly.
You really need to get hold of at least one hen to check their bums over - though if you can look at them all it would be better. If they curtsey for you all the better, but if not the principle is just the same. I catch hold of mine from the top, using both hands to secure their wings so they don't flap. Bring the bird close to your body and manoeuver one arm so it is underneath the hen, with the hen's head pointing to your elbow. This way, the hand that is underneath the hen can secure the legs, 1 leg between the index and middle finger, and one leg between your little and ring fingers. The hen should now be pretty much secured, and as she is laying on your forearm with her body supported she shouldn't struggle (or too much - but these are hens, so you never know... at any rate she shold be secure!)
You can now quite safely tip her up (heand toward the ground) so you can have a good look at her vent. Have a furtle amongst her feathers to see if she has lice, any broken or inflamed looking skin, to see if she has any poo in her knickers etc. You should also be able to see how many feathers are missing.
At this point you will be able to treat accordingly.
I would recommend that you give them a chemical wormer at least once a year, rather than just verm-x, as while verm-x can help keep a worm burden down by inducing an inhospitable environment for the worms, it doesn't actually kill them like a chemical wormer would.
The feather should grow back just fine after the hens normal moult, but she will probably look a bit thread bare til then.