Installation is fairly easy--you will need a soldering iron, solder, and wire cutters. The board is marked with part numbers. The resistors you receive will not be marked, so you'll need to either read them or test them with a multimeter.
If this seems too complicated, you can buy a completely built PA3004 replacement here. If you just want to buy a bare board, that is available here.
Here are the instructions for assembly:
Part Location
Small blue capacitor C1
1N4148 diode x4 (no paper bits) D1-D4
1N5236B Zener (paper bits) D5
KSC1845FTA x6 Q1/Q2/Q4/Q5/Q6/Q9
KSC2383YTA Q8
KSA992FTA x2 Q3/Q7
100k ohm resistor x6 R1/R2/R3/R4/R5/R6
75k ohm resistor R7
100 ohm resistor R8
150k ohm resistor R9
1.3k ohm resistor R10
Molex connector Bottom
US shipping and handling is $5, and international is $18, no matter what quantity you buy. All my small parts are set up for combined shipping, so just use the "add to cart" feature and then check out all at once, and it will combine shipping. If you have any questions, please ask.