It is wiser to choose a repeating pattern so that you can clasp one end of the string securely before you proceed with stringing the necklace without worrying about the symmetry. In case you want your necklace to be symmetrical then you need to put the middle bead and then proceed on with stringing outwards making it certain that each side is the same. In that case, you need to be careful about the beads falling off from both the sides.
After you finish stringing the beads according to the pattern you have in your mind, add clasp. On one end, slide a crimp bead and one part of the clasp onto the tigertail. After sliding the tigertail back through the crimp bead, pull it tight. Flatten the crimp bead to secure it. Trim excess wire if any. On the other side, attach the rest of the clasp. Make sure the stringing is snug to avoid any slag in the string.
Gift a colored beaded necklace to your mother this Mother's Day and make her the proudest mom that ever lived.