Having small wrists I've had to take 3 links or so out of every bracelet on every watch I bought. And since I mainly collect omegas, PO included, lets just say. Its very easy. All you need is one of these:
to get the pin partially ejected, then you can use a pair of needle-nose pliers to pull the pin out the rest of the way.
You can push it back in most of the by hand, but you'll need to use something like a small nylon tipped jewelry hammer to firmly seat the remaining piece of pin. Takes about 5 minutes to size a PO bracelet.