Welcome to the forum
You will need to just clean up the engines front cover(under timing belt) to see the marks, no way around that.
Look here for locations of marks: 2.3 liter timing marks diagram
And you are doing the crank bolt correctly for manual trans, in 1st gear wheels blocked.
One other thing you can try, Put trans in NEUTRAL!!!
Put breaker bar on the bolt and turn crank so bar is against the ground or vehicle frame.
Then bump/use the starter motor, it can often provide enough torque to break bolt free.
You have to do this with automatic transmissions