You already know this but...change it before it breaks. I've seen a few 616's break and the aftermath isn't going to just buff out.

Pull the valve cover and inspect the gears for any that have worn in a shark tooth fashion, they need to be replaced. Replace every guide rail you can, ones that are beer bottle brown are ready to fail.

Clearly mark TDC on the balancer and the pointer from the start so they are easy to read later.

Zip tie the chain to the cam gear and stuff the cavity with clean rags before splitting the old chain.

Don't let the chain drop, don't let the chain drop, don't let the chain drop...

Enlist the help of a FOCUSED assistant to help roll the new chain into place and eliminate all distractions e.g., cell phones.

This isn't a difficult task if everything goes as it should, but something like dropping the chain can be the start of a bad day.

Roll the engine over a few times by hand before starting it up.

Adjust the pump drip timing after the chain has broken in a few hundred miles.

Adjust the valves if not done recently.

Look around town for any older foreign car shops, they may want to sell the crimp tool at a fair price as they never use it anymore. Ask a tool truck sales person for steerage to such a shop.

__________________
"Rudeness is a weak man's imitation of strength" - Eric Hoffer