If you're using approach plates that depict the holding pattern & its sectors eg Australian Jepps or DAPs, hold the page against the DI/HSI/RMI with the top of the page aligned with north on the instrument.
An (imaginary) vertical line down from the holding fix is the reciprocal of the heading you are currently using to get to, and cross, the fix during the hold entry. This line will be in the appropriate sector for the hold entry.
[This message has been edited by Tinstaafl (edited 21 January 2001).]