i approach with drill. but rarely, and never head on. if im above someone and i want to use drill as an approach, i either
A) feint a fastfall, then use a double jump just before i get in attack range, then if they did an attack i can punish, i follow with drill
B) fastfall my drill and aim it one roll dodge distance to the left or right of my opponent. if they rolldodge, you get a free hit/string starter and if they dont rolldodge, you land far enough away to almost always be safe (unless its like samus and she shoots you with a charge shot...keep moves like that in mind)
also if your opponent is hanging on the edge and they have a tendency to get back on the stage by using a jump followed by an immediate airdodge, short hop dair ***** that because of its startup lag and duration (but i guess thats not really an approach, lol)