OK, spider veins barely there sounds like it *should* be hatching. Using your tweezers, slowly and bit by bit crack/peel away the shell until you are close to the inner membrane without pulling or tearing the membrane. Has the chick pipped the membrane yet? Does the membrane seem soft or kinda firm? Once you have the upper portion of shell away, using your WARM wet paper towel drop 1-2 drops on the membrane and wait for it to make the membrane transparent. Look for veins. Look for the position of the chicks beak (assuming it has not broken the membrane yet). If you can locate it's beak or where you think the beak would be, poke a very tiny hole in the membrane. Wait a sec and check for blood. If there is blood like it is flowing and not like jelly stop and wait 30 minutes. If there is no blood tear a very minute bit of the membrane. All this time you need to be keeping the membrane wet and transparent so you can see what is happening underneath. After making the initial tear, wait for 30 minutes then working your way around the shell as if it were the chick hatching, tear another very small tear and wait 30 minutes.