There used to be some but when site updated the images vanished.  Its not hard just snug against a few cable plugs.  The CRT is supposed to discharge on power down but there is no need to touch the crt to mess with these really.  The analog board can stay in and the logic board unplugs and slides right out.  

Brand of the battery doesn't really matter a whole lot, it just depends if the inside guts leaked out onto the motherboard.  Its been 20 years and if they don't say they did not know or want to look.

Gamble is yours, Ive gotten worse and made them work.