Wiki does have a reasonable piece on it.
http://en.wikipedia.org/wiki/Bishop_and_knight_checkmate
It has been discussed a few times on here.
Thread 132547 Has some RHP examples of player doing it (and some not.)
The technique is to force the King into the same corner that the Bishops covers.
If you have a light squared Bishop then it is either h1 or a8
If you have a dark squared Bishop then it is either a1 or h8
I think as long as you know this then the 'W' and 'D' method is not needed.
You have no need to get it a 100% correct, just so long as you do it.
You have 50 moves. Just so long as you know the technique.
Wike has two examples. First the infamous game:
Robert Kempinski - Vladimir Epishin, Germany 2001
Where Black, a Grandmaster(!) failed to do it OTB.
[Event "Bundesliga"]
[Site "Germany"]
[Date "2001.01.07"]
[Round "?"]
[White "Robert Kempinski"]
[Black "Vladimir Epishin"]
[Result "1/2-1/2"]
[ECO "E60"]
[WhiteElo "2498"]
[BlackElo "2567"]
[EventDate "2001"]
[SetUp "1"]
[FEN "8/8/8/8/4K3/2kn4/5b2/8 w - - 0 127"]
[PlyCount "358"]
127. Kf3 Bc5 128. Ke4 Kc4 129. Kf5 Kd5 130. Kf6 Bd6 131. Kf7 Ne5+ 132. Ke8 Ke6 133. Kd8 Nf7+ 134. Kc8 Kd5 135. Kb7 Kc5 136. Ka6 Bc7 137. Kb7 Kd6 138. Ka6 Kc6 139. Ka7 Nd6 140. Ka8 Bd8 $2 141. Ka7 Kb5 142. Kb8 Kb6 143. Ka8 Nb7 144. Kb8 Bc7+ 145. Ka8 Kc6 146. Ka7 Nc5 147. Ka8 Nd7 148. Ka7 Nb6 149. Ka6 Bb8 150. Ka5 Kc5 151. Ka6 Bd6 $2 152. Kb7 Kb5 153. Ka7 Kc6 154. Ka6 Bb8 155. Ka5 Nd5 156. Ka6 Bc7 157. Ka7 Bb6+ 158. Kb8 Bc5 159. Ka8 Nc7+ 160. Kb8 Nb5 161. Ka8 Kb6 162. Kb8 Na7 163. Ka8 Ka6 164. Kb8 Bb6 165. Ka8 Nb5 166. Kb8 Nd6 167. Ka8 Kb5 168. Kb8 Kc6 169. Ka8 Bc7 170. Ka7 Nb7 171. Ka8 Nc5 172. Ka7 Bb6+ 173. Ka8 Bc7 174. Ka7 Nd7 175. Ka8 Bd6 176. Ka7 Nb6 177. Ka6 Bb8 178. Ka5 Bc7 179. Ka6 Nc8
The other wiki example is by a rather talented young lady, Judit Polgar,
who played out the mate in a blindfold tournament.
Ljubomir Ljubojevic - Judit Polgar, Monaco 1994.
[Event "Monaco Amber blind"]
[Site "06"]
[Date "1994.??.??"]
[Round "?"]
[White "Ljubomir Ljubojevic"]
[Black "Judit Polgar"]
[Result "0-1"]
[ECO "B22"]
[SetUp "1"]
[FEN "8/4K3/6n1/5k2/4b3/8/8/8 w - - 0 84"]
[PlyCount "211"]
84. Kd6 Kf6 85. Kc5 Ke5 86. Kc4 Bd5+ 87. Kd3 Nf4+ 88. Ke3 Be4 89. Kd2 Kd4 90. Kc1 Kc3 91. Kd1 Bc2+ 92. Ke1 Kd3 93. Kf2 Ke4 94. Kg3 Bd1 95. Kf2 Nd3+ 96. Kg3 Ke3 97. Kh4 Kf4 98. Kh3 Ne1 99. Kh4 Ng2+ 100. Kh3 Kf3 101. Kh2 Kf2 102. Kh3 Be2 103. Kh2 Bg4 104. Kh1 Ne3 105. Kh2 Nf1+ 106. Kh1 Bf3