I've done this recently to my Acura CSX, with K20Z2 engine.
It's not hard, but time consuming task. Accord will be even easier as spark plugs/head cover is easily accessible unlike my car, where everything is buried under the front windshield.
The trick is both intake and exhaust cams should not push to the rocker arm, that's how you understand you are at TDC aside from the cam gear marks. You can also adjust the other valves that are not pushing, but that can be confusing, better to go by the book especially if this is your first time.
Also you don't have to jack up the car and use the crank bolt, you can turn the engine by using a wrench on the camshaft.
Rule: Double check everything.
Rule #2: Do NOT overtighten anything, especially adjustment nuts, and valve cover gasket nuts..
In regards to the valve adjustment interval, I waited till 105k and there were few exhaust valves that were tight, one was very tight. I wish I would've done it earlier as I can do it myself. After changing the spark plugs and adjusting valves, the car was significantly faster and throttle response is much better.
If you are going to do it yourself, do it now and change the spark plugs as well. However, if you are going to pay someone, do it when MM asks, around 100-105k.