I usually try tape first. I (GENTLY) dab away any blood or moisture with a clean soft medium that's not likely to push the shard ANY deeper ( think damp TP, not dry paper towels), & I'm prepped with anything from Gorilla to Duct to box to Scotch tape (sticky side out)ALREADY PREPPED (i.e.: wrapped Gently/Loosely (so it can be easily rotated around your hand & 4 fingers easily) around whichever hand & tape are most advantageous for the task. If you KNOW, but ONLY if you POSITIVELY KNOW, the direction the shard entered, you can either gently move your taped hand along in the OPPOSITE direction the shard entered OR, gently (aaagain, I know) dab one area of skin at a time and carefully spin the tape manually, between dabbing, on your hand so you DON'T USE THE SAME SPOT TWICE just in case there happens to be any other shards you could inadvertently press into your skin.
So, if you get a shard in your left foot that went in from the front & dug in toward your heel, you would begin at the heel & work ur way toward ur toes