Editing text in photoshop may be 2 seconds, but let's not forget you still gotta go through all the successive steps in order to get the site viewable.
I think the use of FrontPage or some other html-specific program would be more beneficial to you. With images & tables, you're limiting yourself to 2 out of countless HTML tags. I would suggest utilizing the tools HTML provides for you, instead of imaging everything.
I understand if you lack computer skills 'cause we all start somewhere, but maybe while you're working on this site in its current implementation, you could just try messing around with FrontPage and learn how easy it is to accomplish some of the same feats. Then, once you feel you think you know enough about how to work with FrontPage or whatever program, convert the site over.
I know you feel you 'got it' now, but believe me, redoing your site w/o images is going to be inevitable. I would just start early while it's still in development!
At my job, there's a guy who designs the site in photoshop or whatever, then it's handed off to another guy to take what he sees on the screen and write the HTML for it (he uses some program; doesn't write the HTML by hand), and then that code is handed to me to get the database connectivity, logic, and processing code in. So photoshop is used to produce a general 'design' of the site, but we still use HTML to make it into a webpage.