There are three ways to take the cylinder out of a lock. Before applying one of these techniques you need to pop the c-clip off the back of the lock or you need to unscrew a bolt type thing. Kwiksets have c clips and schlages and baldwins have a screw thing.
Once you take the thing off the back of the lock you can try one of the following three techniques to take the cylinder out.
1. you can insert the key, turn the cylinder around 90 degrees then push the cylinder out with a follower tool.
2. you can pick the lock if you don't have a key and turn it around 90 degrees and pop the cylinder out with a follower tool.
3. if you don't have the key to the lock and you can't pick it you can use a technique called shimming. To shim a lock you take off the c clip or screw thing then you insert a blank key into the lock. Once the blank key is in you insert a thin piece of metal in the back off the lock and move the key back and forth while applying a slight pressure on the thin metal sheet. If you do this correctly the metal sheet will move forward every few strokes and it will eventually open the lock by holding the spacers up.
Once the lock opens you can turn it around 90 degrees and push the cylinder out with a follower tool.
Once you get the cylinder out you can easily take 1 or 2 pins out of it by tipping it over and holding your finger over the pins that you want to stay in.
To remove spacers and springs get a plastic bag and slowly back the follower out of the lock inside the bag until you remove however many springs and spacers you want to remove.
After this put the cylinder back in the plug very quickly while having it tilted at an angle. You want an angle so the spring doesn't put the spacer into the first or second hole. (i learned this the hard way)
Thats the basics to repinning a lock. Good Luck!
By the way you can make a follower tool out a 1/2 inch wooden dowel. Any you can get the thin piece of metal/shim stock out of dvd security packets.
Cman