I used to stress about this too. I even got my vet to trim them cos I was too scared. She told me you can’t cause pain by cutting too short, it’s no drama if you do. She said to rub a block of soap on the too short nail to stop bleeding

I do my dogs nails myself but I only cut them a tiny bit, even if I know I could go more I still only cut them a little bit because I don’t want to take the risk. I also have a bottle of Stypic powder on hand for if I do accidentally make a nail bleed. Thankfully this hasn’t happened yet but it’s a good thing to have just incase. I cut them every few weeks or so just to keep the quick of the nail short.
Some people walk dogs frequently on pavement as a natural file, others I’ve seen by a nail file dog board which you can put treats in and when the dog scratches to get the treats out they naturally file their nails!

If you’re not sure I’d recommend taking your doggo to a groomer/vet and asking them to show you.
Alternatively there would be YouTube tutorials.

I’d let the groomers or vet techs do it tbh. The first time I cut my dogs nails I must have “just” knicked the quick, he never reacted and there was no blood at first but shortly after I was done he must have banged the nail and omg so much blood everywhere. Again, no pain reaction to it and he was just running around playing leaking blood everywhere! I was bawling, my husband called the vet for advice and she said to scrap the nail into a clean bar of soap and it’ll create a waxy seal to stop the bleeding. It worked straight away. We know let the groomers trim our dogs nails.

Lots of walks on concrete or foot paths (heat/weather permitting) can help to keep the nails under control. We do occasional nail trims with a pet nail trimmer and a gradual approach – tiny clips at a time to prevent clipping too short and causing bleeding.

You have to be very very careful when trimming nails as they can bleed. We just get it down at the vets for safety now