Don't bother changing up your training too much for a race so near in the future. Concentrate instead on form and strategy.

If you can ride the course, and often, that would be ideal. Learn what the wind is like during the time of day you'll be racing, where the hills are, and how they feel.

Practice pacing so that you go have increasing intensity and speed every 1/3 of the course or so. This will prevent you from hitting "the wall" early on and ruining your speed for the rest of the race. This ramping of effort is hard, and you don't get there by being able to go too hard at the end. You get there by backing off a bit at the beginning -- which is tough to do.

In my last 8-mile TT, I shattered a 10-month-old personal best. I started off just below my LTHR (170bpm). I ramped it up to 174 or so, and held that until 1/2 the course was over. Then I ramped it up to 178 until final 2 miles, where I bumped it up to 182 or 183 (my MHR is 194). In the last 1/2 mile, I went all out, finishing at 188 bpm and completely gassed.

Anothert recent discovery for me is that everyone else is right: flexibility is important for time trials. In two days of hamstring stretches, I was able to completely eliminate a problem I've had with my legs falling asleep in TTs. It's been a week now, and I can easily get my fingertips to the floor, and I've never felt so comfortable bent in half on my bike