Website Redesign

If I am a graphic designer and I want to make a website if I can redesign the website, it can be done?

Should I get a web site I can see if there is room for them or if THST not be a good idea.

I have even thought to ask about a site that I am a member. I'm desperate site design, but I can offer? So far, I do not know why I know how people are attached to their creations and I feel after all problems are gone offend, to make your site. On the other hand, is perfect in one browser but not another and that's why I love him. I guess if you know the owner of the site then best to try, go with your instinct, you accept your offer, but beware of putting it across.