Mondays have been really stressful for me (there is always a lot that I want to get done, and it is hard to adjust my schedule around all of the other missionaries - I never really know ahead of time how much time I will have to email or write letters).
We got our car back, but the A/C wasn't working for a few days (but today we realized that there was just a button that we missed or something because it worked for the other missionaries that borrowed the car from us). However, we still have been biking a little to conserve miles.
The good thing is you sort of get used to the heat (it isn't comfortable, but I at least don't feel like I am dying all of the time).
That is so cool that you got to go with the missionaries to a discussion. I wish I could go to a discussion (it seems like it has been forever since anyone let us come and teach another lesson). Honestly, I've been a little down because we have so few investigators and the few that we have wanted a break from the lessons. Hopefully things will pick up more this week.
One good thing that has come out of all of this is that one of our less active members has started to come back to church. She told us that it has been a wonderful blessing to have us come by and visit her every week, and that simple act of visiting her had inspired her and reminded her of her testimony. It was nice to be able to see something good come from all of our efforts.
As far as your speaking fears go, I don't have a whole lot that I can say right now. But one thing that has helped me is prayer. I pray that I can have the faith necessary to rely on the Lord and trust that He will guide me to say and do the right things. I have found that to be able to speak up in lessons, I need to speak up everywhere else. I can't just walk into a lesson and become a missionary; I have to be a missionary everywhere. It is hard, but as long as I don't become discouraged and continue to push myself, things have worked out.