I have a 1996 Honda Civic LX. It has 170000 miles and it is in excellent conditions. Questions:

Honda Civic

Honda Civic Timing Belt Change Interval

1. What is the best mileage for a time belt change? (Last change was at 90K, as scheduled)
2. What is the most cost effective approach for this change? (Honda dealer; independent mechanic or try to do it myself)
3.   It shows a slight knocking of valves when cold, even using mid octane gas. Is this related to the timing belt? Should it be addressed at the same time? sooner?