Jeym, how old are they? Beak growing twisted? Mine are cooped most of the winter so i had to trim nails. They had gotten too long and one had broken and bled, so i fixed them up. Beaks only need done on strictly indoor birds though usually; they normally wear down with dirt scratching. Young birds won't need it at all unless beaks are awry which is a faulty breeding and can't be fixed. You trim those just so they can still eat and to minimise the twisting of the jaw bone.
I use curved sharp rose pruners or better is the nail trimmers for dog's nails you stick the nail into the hole;
Beaks are easy since you look for the clearish part of the beak by the point. It will be easy to see if you are under a sharp light and you have tame birds. Even good birds are spooked by shiny things by their faces though!!! Sit the bird on a towel in your lap with her facing right on your right knee if you are right handed. Gently push her bsck down so she is laying down, wrap the towel over so her eyes are covered up but her beak is poking out. It is best if your hair is up and can't fall in your eyes! The top beak part is the usual culprit. The bottom beak part should fit into the top and get worn down naturally, a little clearish part is good and much like a short fingernail to protect the beak nerve. The top beak part may start to curve too much past the bottom, again usually on strictly indoor birds. Google overgrown beaks fof pic reference. If you are sure than you simply snip off the offending bit,leaving the protective bit. I usually pinch gently on the sides of the beak and push it apart a little. You only need to get it a little in the trimmer hole- you need to eyeball how much clearish part needs cut BEFORE the actual cut as they often flinch and it needs be done with speed! No time to look while actually doing. Watch that she isn't sticking her tongue out or you will cut it! If you take your time and allow for many practice flinches from her she should settle down. Each time will be easier! Keeping the eyes covered is really the key. When you finally get the beak in there where you were aiming pinch quick and make happy spothing talk sinch it might be startling for her.
Toe nails- re wrap her, this time with one foot out. Eyes need not be covered. Hold wings firmly to the body under your left arm on your lap. Use your left hand to pull her foot away from her body and try to get the toe being done straight. Easiest if you hold her hand since she can't curl it into a ball, just hold with one toe sticking out. Look for the clearish part- usually just past where it curves under. Trim this off and leave a little to protect the sensitive vein. Keep repeating this to finish the foot, adjust towel and move to the next foot. She might be ticklish so a firm grip on those feet will help you both.
If at any point you are unsure of a cut STOP! Keep looking and handling her until you are sure of what you see. It hurts and they can bleed profusely if you are overzealous. In the event you really can't see where the overgrown part stops try to have someone who has done it before show you how to do it and what to look for. Bird pet shops sometimes trim their bird's nails and though they are much tinier you will see. ( i was shown parakeets as i used to keep those by a friendly store owner) If you are on a computer my signature link "fuzzy's notes" should have a link with illustrations, not sure which section though!