When drilling metal, make sure you keep plenty of oil on the drill bit. This will cool the bit and make everything work much better.
Also, strongly recommend using a small drill bit first to make the hole and then a larger one to widen it to the required diameter.
No need for clamps etc - just get a friend to hold the pipe steady - especially if this project is likely to be a one-off.
Finally, make sure you put a container of some sort under the area to collect both extra oil and the metal swarf.
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