Time:
A wall 2' tall and 10' long (the scope of our discussion), from start to finish, will eat up a weekend. That said, if you can get help with the hard part of the job (which covers pretty much all of the job), that is to your benefit. The more, the merrier. There may be a trade-off, however, for the next time someone says "Honey, will you go look at curtains with me?" Think about it...
Tools:
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A
brick hammer -- to knock the stone into an acceptable shape.
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Grout bag (optional) -- to get the grout into the joints; alternatively, you can use a small trowel, if the joints are large. For stacked stone, you should try to chip the rock neatly enough such that joints are not visible; no joints, no grout! What a deal.
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Brick ties -- generally used for brickwork, sometimes a mason will use these guys to stabilize the wall rock as it's put up.

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