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If you're using the powerite you don't need to worry about whether it's a hot chassis or not. You're good to go.
You'll want to start at the end of the signal chain and work your way back to the beginning, checking for results along the way.
First step would be to connect your composite output to point B in the schematic, leave the level control set at the 1V reference position. If you don't see good results there you can try adjusting manually to see if you get a stable picture - the Sams says it's a 5V signal there, so you may need to go that high. If you still have trouble you know the problem is after point B.
Next you'll use the IF output jack to connect to whatever the input and output of the various IF stages are. Sams normally has a test point labeled with a diamond but if not you can usually do grid and secondary of the IF transformers for testing. Set the yellow button to IF, the others don't matter.
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