I'm about to replace the timing belt on my "1998 Honda Accord vTec 4cyl" myself. This will be the biggest [most complex] automotive task I've done in 30'ish years. I would appreciate you all taking a few moments of silence and sending me positive energy...

...thank you.

 

Its not that bad I did a v6 and it took me 1 week. Tensioner was bad, serpentine belt tensioner broke, didn't have the tool to hold the crank pulley in place.

 

Well, the best advice I could give, is replace it all: Both belts, all three seals (get the balance shaft seal retainer from Honda too), water pump, tensioners. Mark everything (cam/crank positions), take your time and it should go smoothly. It would be time to change the spark plugs too. If you use factory belts, you should be good for another 100k..good luck!