What specie bird do you have?
I use small nail clippers, but if you have a large bird, you can use toe nail clippers or go to a beauty supply house and look at their nail clippers...they look like pliers/wire cutters.....
You may want to have someone help you & towel the bird until you have done it several times & feel comfortable doing the clipping, but if you have a Patagonian conure or other bird larger than a smaller conure, you may want a helper every time you trim their nails.....
Here's a link with toweling photos that are pretty good:
Bird Toy Outlet Bird Safety Article - How to towel a bird
The size of the towel would be dependent on the size of the bird...you don't want to wrap a parrotlet in a beach towel.....also, you don't want to keep the bird wrapped too long, as it can overheat...likewise holding a small bird in your hand.....
You might want to check with pet stores and area veterinarians whether they trim parrots nails, what they charge & if they are willing to show you the proper way to trim...that way you might be a bit more confident when doing it yourself.....when you do decide to clip, you will need to firmly hold the toe to prevent the bird from wiggling it out of your grip as you close the clippers...that's usually the reason many nails are clipped wrong.....
To get your bird used to towels, make a game of it...let the towel lay around on a table & let the bird beak it, taste it, walk around it and/or play with it.....then you could drag it across the table/floor & tease the bird with it, while laughing & making a big deal out of it...even wrapping & unwrapping the bird, until it doesn't shy away or get stressed around the towel.....
For stopping bleeding, flour, cornstarch, cayenne pepper or you can purchase quickstop at most pet stores.....unlike we humans, the capsicum in pepper does not affect parrots and it will quickly cause clotting of the blood, instead of just packing the toenail to stop the bleeding.....
Good luck.....