Instructables
Picture of How to assemble a skateboard
This instructable will teach you how to change a skateboard and or replace the trucks. The process is fairly easy and straight forward. It is most convenient to assemble a skateboard on a work bench such as the ones found at TechShop.
Materials needed:

deck
hardware
trucks
#2 philips screwdriver
3/8 wrench 
 
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Step 1:

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First, with a 3/8 wrench and phillips screwdriver, begin to disassemble your old skateboard (disregard this step if you are setting up a completely new set up). It is important to mark which truck is your back truck and which is your front tuck before removing both from your previous set up. If the trucks are misplaced on the new skateboard, the board will feel as if it is backwards due to the adjusted bushings from the previous set up. 

Step 2:

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Now, begin to insert the screws into the new deck. Hardware can be reused, but new hardware is recommended. The problem with reused hardware is that the screws can become stripped after excessive use, or the nylock can be weakened. With the screws in, place the back truck on the tale side and the front truck on the nose side. 

Step 3:

For the last step, place the nylocks on the screws finger tight. Once all nylocks are finger tight, begin to tighten them with the wrench and screwdriver. When tightening, hold the screw in place with the screwdriver and use the wrench to do the turning. This will help the screws sink into the board without twisting up the griptape at the head of the screw. It is important to tighten each screw evenly in order to prevent any one side of the truck to be more tight than the other side. If the hardware is tighter on one side, the screw can break under impact. Lastly, sink the screw into the board until it is flush with the griptape. And that is how you change a skateboard and or trucks. I assembled my new skateboard at TechShop.
doug107413 days ago

I was just curious how you determine the front or the back truck. Aren't both ends the same nowadays so it doesn't really matter which way the board goes? The last skateboard I had was back in the days of only one "tail" so you always knew the front and back end (late 1980's). I was also going to ask about the riser pads for the trucks but somebody else already mentioned it. I know we used taller wheels "back in the old days" ;-) so the smaller wheels used currently may not need them. Glad to see Independent is still around, I always liked them.

I apologize for the comment about the simplicity
Now now, he does make a good point with keeping the back and front trucks straight that most people don't think of. Also, shock pads? I've never liked putting trucks right onto the deck, especially on something where there's a lot of impact at the trucks like on a street deck.
Oh I totally forgot to mention shock pads. I never use them but I know there are many out there that do. Sorry about that.