i assume " standard cabinet "  means classic woody cab and not a plastic or metal one. 
- always discharge the tv to be on the safe side. 
- make sure the mounting of the tube and chassis is solid and the chassis is well isolated to avoid shortcircuits. 
- ground all metal parts like mounting frames etc. tvs in plastic shells usually dont come with extra ground . 
- best place for mounting the chassis is like in the original tv , below the tube on a mounting shelf. in case u setup ur screen in  
  vertikal position u can use the inner sides of the cab as a cabshelf. checkout if all the tv wires are long enough , because tv 
  manufactures keep the wiring as short as possible. dont change the wiring in any way unless ur a professional . 
- if its ur first tv job , taking snapshots or making notes can be useful for the reassembly.
- pay speacial attention to the tube. one moment of disorientation while remounting and ur done with it . sometimes its good 2      
  have some help .
- use a blanket 2 store the tube facedown on the ground . avoid scratches from particles on the floor like screws from the decasing
  procedure. 
- i always cut my arcades complete off when leaving the house or the room for more than a few minutes. i dont trust 25+x year old 
  tech stuff and i guess it couldnt hurt 2 have a smoke detector in ur rooms . i never heared of setting up a fire with an old cabinet,
  but safety first. i m a muschi .    
btw. i m no electrician nor tv guy .