There's nothing worse that a shower curtain liner that's too long and constantly getting in the way when you're trying to bathe. Luckily, it's not difficult to trim that shower curtain liner to just the right size to fit your shower.
If the shower curtain liner is already hanging up, take it down, using the step stool if necessary.
Measure the length of the shower curtain itself, from top to bottom with the tape measure or yard stick. Make a note of the measurement.
Next, lay out the shower curtain liner on a flat surface. (The bed works well.)
Using the measurement of the shower curtain itself, mark that length on the bottom of the shower curtain liner on both sides. For example, if the length of the shower curtain is 60 inches, measure down the liner to 60 inches, add 1/2 inch to protect the curtain, and then mark the liner.
Using the yard stick or tape measure, and keeping the line even, mark the bottom of the shower curtain where you want to trim.
Following your markings, trim the shower curtain liner to the right size with the scissors.
Rehang the shower curtain liner and you're done!