I agree with TromboneAl, go to early-retirement.org ! They provide a vast wealth of information. I found that forum about 5 years before I retired. They helped convince me that " hey, I think I can do this" and helped guide me into retirement after 35 years of work. I'm in my seventh year of retirement and have totally enjoyed it. Money seems to be much less important now as compared to when I was working.
I tell people that are thinking of retiring, that retirement is a learned skill! It took me over a year to finally slow down and smell the roses. Even so, my days are almost always totally filled.
The only thing I would have done differently, is retire earlier! When your working the scary unknown of not having a regular paycheck can be daunting. I started thinking in terms of " how many summers do I have left?". When you start thinking in terms of Summers left, you realize life's short and I wasn't going to give the dam corporation
any more of my precious Summmers!