To remove skin tags naturally at home you can tie it off using some dental floss or small string to cut off the blood supply to the skin tag and within a few days to a week the skin tag will usually naturally just fall off.
Or you can buy a skin tag removal tool for pretty cheap and use the easy to use skin tag removal tool at home to get rid of the skin tags.
Another option is to tie the skin tag off and then use a pair of sterile scissors to cut the skin tag off your skin but it could be painful.
A doctor will usually cut off the skin tag using sterile scissors after tying off the blood supply using some sterile string.