Hi Carol- its like talking to myself which i do a lot off..
First thing is buy yourself some good walking shoes, thats a ll i can add...but good luck.
Hi:
That's a great goal. I did it myself a couple of years back, and it's a wonderful experience.
As you say, you have loads of great places to hike all around you - joining a local hiking/rambling club would be a good place to start. You'd meet people who know the routes, the clothing, equipment etc, and probably some who've done the 3 peaks.
Outdoors stores (of which there are many in the lake district) usually have notice boards/info on local clubs.
Good luck!