It's best to wait to trim his nails until you get the SoftPaws packet, with its complete application instructions - you do trim the claws before applying the nail caps, but not as short as you would if you're just trimming the claws to blunt them - if the nails are too short the caps won't adhere to the claws properly. Also, as the instructions warn, you want to fill the caps only 1/3 full - if you use too much glue it will seep out around the edges of the cap when you put it on, and stick to his fur.
Also, if you have any trouble putting them on (hopefully you won't
), some vets & groomers will apply them for you, and let you watch so you can see how it's done - that's what I did the first time, because I was nervous about putting them on myself at first.
After you put them on, try to distract him from his paws for about 10 minutes, with some petting, his favorite toy, or some treats - that will allow the glue time to dry thoroughly, making it more difficult for him to remove them. Most cats will initially chew on the claw covers & try to remove them - if you notice he's persistent about it, you can dab some bitter apple on the caps (spray some on a cotton ball & wipe them with it, or spray his claws directly). If he manages to pull some of the caps off, just put new ones on & coat them with bitter apple, and try to distract him from them.
Out of 4 cats I used the caps on, 2 accepted them immediately with minimal fuss, 1 took them off but then accepted subsequent applications without fuss, and 1 took them off pretty persistently, but adjusted after couple of weeks - I used bright pink caps for her, so I could easily spot when she'd taken one off, and replace it.
I haven't been able to get to the computer much lately, but if you have any questions drop me a note & I'll try to check in & see if I can help. www.softpaws.com
has a phone number you can call if you have any questions, too.