I hear it's pretty difficult to accomplish with a hand drill, but I've also heard it being done before so if you're determined it should be doable. I didn't drill my cylinder, but it looks like a 3 mm hole, I'd start small and widen the hole to ensure that you dont get too much otherwize you'll get air bleed through your cylinder. maybe start 2mm. then widen to 3mm if nessissary and so on.
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Before you do anything, do you have replacement parts for what you may screw up?
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A replacement cylinder is 40-90 bucks on UN company. Why spend the money for a replacement part if you probably wont screw it up? Many people have drilled their cylinders for upgrades before, pretty negative of you to assume that he is doomed to fail. Cylinders and cylinder heads can be ordered from WGC, UN and the like if you require.
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Recommendation; find a local expert if you want to do any upgrades on an unfamiliar gun.
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No kidding. Im sure we can all afford guntechs everytime we want to even think about doing anything. He's obviously familiar with the gun if he knows he needs to drill the cylinder pin to get the cylinder head out for upgrades. Furthermore, the more you know about your sniper rifle the better off you are. They aren't complex machines comapred to AEGs, and there is a lot of fine tuning you can do to it if you learn to do it yourself. If you can find an 'expert' great. But by the sounds of it you've already done your research you should be fine.
Without a drill press, I would suggest you at least get a vice or clamp to hold it down while drilling. The metal for the cylinder is pretty strong stuff, there are some slip marks on my cylinder.
Also, the fella mentioned above that he wanted to achieve 430 - 450 fps, I would NOT recommend the pss150 spring, that pushes it over to around 480, if you ever plan on adding a tightbore and other things, it may go even higher which may get difficult to get into games or play safely depending on your area of play and field limits. I have both a pss 130 and a 150, mine chroni's at 430 and 490 respectively with a 6.03 (pro sniper length) barrel. I just stick with the 130, chronied the 150 once and put it away, plus it was a challenge to chamber a shot quickly with the 150 spring.
Anyways, good luck on your upgrades.