the basic theory goes like this:
1. set the new knives in the cutter head.
2. find the one knife which is tallest when the cutter head is rotated to top dead center.
3. using a straightedge, set the outfeed table to that exact height.
4. using the same straightedge in the same position, set the other knives to the same height. this is important so the knives wear equally and don't chatter.
5. the infeed table adjusts as normal, according to how much material you're removing.
note: this all assumes that the tables are parallel to each other.
some companies make magnetic jigs to assist with this, but the same principles apply.
JSP - the snipe you're seeing at the end of the board might be because the outfeed table is too low, or the tables aren't quite parallel.
have patience and good luck!