Obryn
Hero
This is what I do for my games, and I strongly recommend it. It was among the best $20 I've ever spent. 4e, more than previous editions, benefits from interesting and compelling terrain. It won't matter if you're a little off on some measurements, but interesting maps are (imho) essential for players to get the most out of forced movement effects.You can get a large pad of 1" square paper at most office supply stores. Use these to prepare detailed maps of known encounter areas before the session. You can make them as simple or complex as you feel like depending on available prep time. You can fold them up and store them in a folder.
Also, I think Fiery Dragon released their Creature Counters for KotS for free. I expect they probably still are, if you check their homepage. If you can, print these out in color on some cardstock... It makes a big difference if you don't have a ton of minis. I like them so much I've bought them for every other adventure we've gotten to. It's easy to separate them out by encounter area, too.
It takes some time to get comfy in the DM seat. Don't give up if it doesn't go well at first.

-O