My church choir meets then for our weekly rehearsals. 

Mental rehearsal ahead of time (asking what-if and thinking through possible responses) might be the best way to deal with these possibilities.

Live everyday...no dress rehearsals in life!

I think I need to rehearse my next proposal a bit next time, or better yet email the proposal in writing and call those who reply.Funny you mention speculating, as she also suggested I try the stock market instead, ha.

To address some of your points:I have prepared and rehearsed my "elevator speech" over and over.

Do what experienced theatre companies do: first learn what you want to say; then have some dress rehearsals among supportive people.

Hey Justin,As John noted preparing by rehearsing with enough practice exams was key me passing the Florida sales associate exam.

Once you do that you need to practice and rehearse these answers so you can answer them immediately and with confidence.

I'm interested in learning about taking a lease for a space that I would in turn sublet for yoga/pilates/fitness classes, rehearsals, workshops, etc. 

I'm going to have to rehearse so I don't sound like a newbie.