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Yes, assuming you don't want to use the Spiderings as I'm pretty sure you can't do that with P2M spider. You need the correct P2M lockring tool, a vice with soft grips, maybe some hot water to free up the existing loctite, a big torque wrench and two types of fresh Loctite - one is for the splines and one is for thread-locking the lockring.
https://www.youtube.com/watch?v=f-_mdaKAaHQ
Loctite Compounds 638 (spline) and 243 (lockring threads)
New to power meters, my bike at the min has a hologram si crankset and I have impulse bought a hologram si crankset with a power2max power meter on it. The power meter crankset is not the crank length I usually ride. Can I just take the spider rings off my crankset, take the power meter and chainrings off the other and swap them over?