Is it better than just using Dreamweaver and inserting tables and all the forms needed?
Also, does it take much time to convert the PSD file into HTML?
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If you are not using a template and designing a website from scratch it's better to use a graphics program such as Photoshop. If you try building a site with just Dreamweaver you'll have a hard time make the graphics fit properly later. Don't worry about forms or tables. First you can mockup the forms in Photoshop quickly. You'll style them in the website using CSS the border, color, shadows, sizes etc. The same goes for HTML tables you can style them with CSS. That said it's much more common these days to use CSS to create grids than using tables. Tables are good when your displaying dynamic data pulled from a database. Otherwise if you are just using a table to align content left right center or make columns of information etc you should use CSS.
It doesn't take much time to convert a PSD design into HTML if you are familiar with slicing a PSD and understand how your website will be built. Will it be a fixed width website or will it be fluid? Will it need to be fluid vertically? An example is the background graphic of a sidebar. If you plan to add more links buttons whatever into a sidebar over time is your graphic already set to 200x400 pixels? If so will it repeat without looking funny? Or will it be better to slice a 200x1 pixel graphic and use CSS to let it repeat so as the sidebar grows the background repeats automatically and is fluid.
What I would do if you are new to slicing PSD's into HTML is download some free PSD website templates which are pre-sliced to get an idea of how they are built. I would also suggest you do not use the built in HTML generator of Photoshop after you've sliced your graphics. It does not account for fluid design and is pretty bad HTML.