Hi Laura/Tammy,
.
I'm actually going through that now too. I've been Kay on forums for years, and all of my friends that know me IRL know me by that name too. (It's actually my first initial, which made it a simple default.) I'll be changing that probably within the next month. Still unofficial until I come out at work, but I'm sure it will take my friends some getting used to. Just as many have trouble changing pronouns, it'll take them time to remember the new name first instead of the old.
.
In the end, it's your name, and you'll have to live with it for the rest of your life. Make it something that you like, and that you're comfortable with. As long as you're happy with the name, the small bit of adjustment your friends will go through shouldn't be seen as an imposition...and if they're really friends, they'll understand that change is often a necessary part of growth and discovery of who you are. (8 months isn't so long a time that things have been set in stone.)
.
I've been mullling my name change over for the past 2 months, and will probably give it a couple more weeks just to make sure it really is what I want. (Just to make sure it's not just a flash in the pan. I understand about not wanting to be seen as changing names on a whim again and again.) Give it a little time and see how it settles. I'm not sure how long you've felt this way, but if you still feel this way in a month, I'd say go for it.
.
Whatever you decide, I wish you the best of luck.
.
Kay