wow.. taking my advice.. now that is scary haha.
I am still new to all this myself, but I have found the postgres manual to be one of the best, of any type, that I have ever looked at. I love it!
my only advice is personal and not technical... I have gotten frustrated with stuff and find it amazing that I just go to sleep and the next day I can understand it more clearly. Sometimes it just takes time
I have not heard of Kexi.