i wouldn't mess with the timing belt, if you have any major engine work done thoug, i would go ahead and have them change it out. but as far as i understand we have zero clearance or something to the extent so if our timing belt breaks the engine won''t be f*cked. as for the tansmission flush, the books usually just tell you to drain and refill, it's really not that hard, i've done it myself before. of course I did it on an automatic, i'm not sure about a manual tranny. The throttlebody isn't too bad either. If you look through the old post, using the search you will find info on it, including the first time i messed with it on my camry, and the mistakes i made and some tips also. good luck.
ryan