You have a different type of decision when considering a trump lead, which, depending on the auction and your hand, may be an aggressive or a passive choice.
The skill that most agree is extremely difficult and absolutely critical to our success is the one we need an average of six or seven times every session: making a good opening lead.
When the declarer has an abundance of trumps — usually nine or more — there are many situations where a trick can be gained by putting an opponent on lead.