I agree that Kompozer is good and easy to use. I have one site that I do with Kompozer and another that I try to do with Joomla (consensus seems to be that joomla is probably better for sites anticipating lots of traffic). My joomla site was hacked a few weeks ago and I have still not got it back up. Probably have to reinstall joomla as the hacker changed the password. Even though I use both, I am not too good with either. But my kompozer site is functional and, I believe, always up. And I like it (and joomla) better than bluefish and quanta, both of which are a bit too geeky for me.
I don't really know the main difference between joomla and kompozer and would like to learn what it is.. I think joomla is hosted by my ISP and have no clue how kompozer is hosted. I think its just on my machine. I know it took me a LOT longer to get my joomla site connected, up, designed and all that. Still, there is a lot of joomla help (google joomla). I think joomla has much more support in English than Kompozer. So, as everyone seems to think its more powerful, if you have the time to learn it (or the money to hire someone to help you learn it), you might start off with joomla.
In any event, with those qualifications, my own experience is that if you are going to do it yourself, you should probably start with Kompozer. Right now, I wish I had done both my sites on Kompozer. Nothing against joomla except I don't find it all that intuitive.
If I were you, I would try to get someone to do your site (get it connected and all that) in Kompozer, while insisting that whoever does it bring you along so that eventually you can edit and update it yourself.
Finally, I would listen to about anyone else on this. There are probably only two or three people in the world who know less about web-site development than me. And likely none, knowing so little, who would venture to offer advice.