Preparing for Uganda

I'm going on a missions trip to Uganda, and I just finished reading "Mack and Leeann's Guide to Short-Term Missions", by J. Mack and Leeann Stiles. I might have read it too fast, but it was so interesting that I couldn't put it down. Maybe I'll go back and outline some points.
One main lesson I took from it, however, was the fact that if you can't evangelize in your own country and culture, it doesn't make it any easier when you're in a foreign country. They said that to prepare ourselves, we should already be practicing evangelism so that the transition from America to wherever we are will be as smooth as possible.
I struggle with evangelism because I don't often see opportunities to talk about my faith. The thing is, there are plenty of opportunities, but my eyes aren't open to them. Also, when they do arise, I'm so at a loss for words because I feel that I don't have enough knowledge to share. I think this can easily be fixed by brushing up on my bible knowledge and liturgy about my church. I need to pray continuously, though, that I remain sensitive to the fragile culture in Uganda, and not feel like a "soldier of Christ".
One chapter in the book talked about a couple of missionaries who went to Guatemala and started their work by setting up their own little farm. The wife dressed in indigenous clothing, and helped out her husband who worked the land using modern techniques. They didn't advertise what they were doing, but they quietly went about their work and waited for curious people to ask more about their methods when they saw how much produce the couple was able to yield.
I know that my trip is the shortest short term trip that you could take (ten days), but I would rather be overprepared than underprepared. Who knows what God could do to my life while in Africa within that short period of time?