Anyone can learn any instrument, but getting started is the hardest and most crucial part.  These characteristics tend to make beginning easier.

The trombone is the clarinet of the brass section: an easy-going instrument that doesn’t require a specific teeth formation to play.  The only deal-breaker requirements are arms that are long enough to extend the slide, and good ears to identify when the slide is in the right position.  The trombone accommodates small or large lips easily, and doesn’t require agile fingers.  A moderate amount of air is needed to play (though strong lungs make for a big sound), and a medium level of air pressure.

Personality: Trombonists tend to be humorous and mischievous.  They make great leaders as they aren’t too uptight, but also aren’t too laid back.  They can be talkative or quiet, but usually like to giggle and may enjoy a good fart joke from time to time.  Trombonists tend to be less detail-oriented than the rest of the band, but make up for it with their enthusiasm.

Brass requires strong lungs and lips, but doesn't require fast fingers like a woodwind.  While I‘m not encouraging it, brass can take more of a beating than woodwinds, so younger or less responsible students can learn these instruments as they mature.  Brass instruments require good musical aptitude – they do not just play themselves if you push down the right buttons.  For this reason, brass players need confidence, strong lips, and good ears.  The ability to change their voice from high to low pitch and the ability to mimic someone’s speaking can be signs of a good beginning brass player.