Advice for swapping out my gas dryer myself
Turn off gas to dryer.
Disconnect old line.
Take off teflon on old line.
Add new teflon.  (some will tell you to use a new connector but that is your choice depending the crimping of the old one and shape it is in)
Connect to dryer.
Turn on gas.
Check for gas leaks.
Run dryer and verify the gas working via flames on bottom burners.