Measure the distance the balancer is from the timing cover, so you will know the approximate distance when you go to reinstall it. Spray some pb blaster on the balancer (sometimes you need to heat up the balancer around the crank) and REMOVE THE BALANCER WASHER when you removed the balancer bolt or you will snap off the removal tool bolt in the crank snout.
When you take of the timing cover, make sure to get the two front oil pan bolts on the bottom, and be careful not to tear the pan gasket. I would inspect and replace the front seal on the cover as cheap insurance. Inspect the timing cover for warpage, rust, or pitting. They are aluminum and often leak. You will need to remove the old timing cover gasket and clean the mating surfaces- brake clean, some gasket scraper, or straight razors work. If the lower pan gasket it fairly new and is the rubber kind, you can get away with reusing it. Stuff a rag or cover the exposed pan opening to avoid getting any gasket of crap in the pan. If the pan gasket is old, ripped or cork. cut the front pieces off and buy new cork pieces. Make sure all of the gasket surfaces are squeaky clean,
Might as well check the timing chain while you have the timing cover off for slop or broken teeth. Better to replace it now than doing this job twice. Test fit the timing cover and pan gaskets- you'll need to trim them. Set the new gaskets with Blue RTV on both sides of the gaskets and put a blob of RTV in the corners of the pan gasket. Let it set up. Reinstall the timing cover
When you go to reinstall the balancer, check to see if the rubber inuslator is sticking out or if the outer ring has shifted. They are cheap and you should repalce it if damaged. If the crank snout is a little nicked up or has gunk on it, lightly take some emery and buff it out. Also, I would stick the balancer in an oven for a 1/2 hour or so at 300, and lightly oil the crank snout. Align the keyway and push it on with your hand as far as it will go, making sure it is straight. Use the installer bolt tool to reinstall the balancer, when the balance is fully installed, reinstall the original bolt and torque it to 90-100 ft lbs. Do not use a hammer or impact gun to install the balancer.