The HO crowd often uses dabs of white caulk. (not gobs)
A wide spackle or putty knife will pry it right up or slice through small gobs, but the hold is good.
Also, I know you want "a real layout" and done "yesterday". But I always suggest a small carpet loop to run on while you meditate on the next step for the real thing. It keeps the spark going, itch scratched, and keeps impulsive mistakes in the name of finishing at a minimum. It can really inspire imo.
The key to wet metal vs rust is not delaying in drying it fast and fully and wiping a little protective oil on the metal after.
