Questions on staking and Lapping a valve

I once watched an A&P do this on a 182. I have no idea if this was "right", just what he did:
1. "staking. Should the valve be closed?" It will be, since you need to remove the rocker arm. But position the piston so that there's no danger of the valve hitting it.
2. The A&P I watched really hit it hard. (rubber mallet)
3. Lapping in situ. Remove the valve keeper and the spring. Do not let the valve fall into the cylinder, but lower it enough to be seen thru a plug hole. The A&P used a Q-tip on a long wooden stick to put some lapping compound on the underside of the valve, working thru the spark plug hole. Use sparingly. He chucked up the valve stem, rotated the valve with a drill, while pulling outward modestly so the valve was engaged with the seat.
4. He used more Q tips to clean the lapping compound off. I can't recall, I think he moistened each Q tip with alcohol or something, to help make the compound stick to the cotton. After that, he tried to vacuum out the cylinder with a piece of vinyl tubing he had hooked to a vacuum source. Finally, with both plugs out, he tried to blow out any remaining stuff, applying air thru one plug hole, hoping it would blow out the other.
5. He used the "rope trick" to reinstall the valve spring and the keeper (piston at bottom; push rope thru the spark plug hole, as much as you can.
Bring the piston up on the rope (and valve) until there's resistance. You can now push on the valve stem, without the valve dropping into the cylinder).

Bear in mind, this is an inexpensive trick, which sometimes works. But sometimes it doesn't, and then you need to pull the jug to do a proper fix.

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