I'm exceedingly jealous (in a good way!).
I tried to start my very first kuksa today, having found a nice bit of birch log yesterday morning whilst out with the dogs before work. I couldn't find a suitable bit of oak to make a splitting wedge without lopping off a biggish branch from a tree and I didn't want to do that, so I opted for a bit of holly as I read somewhere that that is hard - hard to chop into a workable wedge maybe!
Anyway, the upshot of it all is that I eventually did my log splitting with a bolster and chisel; now I have to smooth out the workable face (do I have to get rid of all the middle bit - may be a small kuksa, this one!) and chop it round.
Lessons learnt so far; try and find a nice stable platform for chopping on, and try and cut your logs square ended so they balance easier.
Not everything is as easy as it looks on Youtube.
It really is worth taking the time to choose the right bit of log for any given project...