The National Archive at Kew

[Neil1689]

Good afternoon,
I am going to visit the National Archive at Kew to do some research into the Wessex Volunteers / Regiment 1967 to 1995.
From an earlier post the Army Dress Committee documents seem to be the ones to look for, WO 32 I believe.
If anyone who has visited the NA could give me some hints and tips on the best way of searching their archive I would be grateful. Neil