How to solder MSOP-EP package with just an iron?
Have not tried myself but here is video of soldering QFN (I believe exposed pad technique should be identical with MSOP):
http://www.youtube.com/watch?v=d-f-SBC0GrU

For general SMD soldering I found this helpful:
http://www.youtube.com/watch?v=3NN7UGWYmBY

BTW: Kudos for makers of this two videos.