Hot to make textures 'fit':
1) Click on one of your views if you have the texture/enetity window selected, select a brush (or brush face)
2) Hit "S"
3) on the small window that pops up hit Fit (or select the texture you want from your texture window then do this)
Texture is stretched/shrunk to fit the surfaces available.
A word of caution: huge textures when shrunk too much will flip and come out looking like a mirror reflection, ie. words will be backwords