dude, you can't crucify yourself
It would not be easy, but If you get the spikes pushed into both palms first, lean back against the board, get the feet firmly affixed, then do the left hand, holding the hammer in the right hand, it might be possible, after dropping the hammer, to bring your right hand around to get some momentum and then, with good aim, swing it backward just right so that the spike, already firmly embedded in the flesh, pierces the wood sufficiently to gain the purchase necessary to support the body's weight.
The key is getting the spikes initially well set, in between the third and fourth carpals, with minimal damage to the nerves or muscle tissue, so you can still swing the hammer. Of course one must also work fairly quickly, because the loss of blood and constant pain will zap the strength.
Of course we're peaking metaphorically--your using crucify as a synonym for defamation and my quick and methodical setting of the hand spikes being a metaphor for posting early and succinctly in the thread, etc.--but as long as we're on the topic of suicide by crucifixion, check
this out. It's a little off topic, but hey, it's a thread about angus, so anything strange is fair game.