LOL!!
Huuh pooff huuh pooh... hehe...Where should I start, this is so 'Hot' subject for me since I have seen so many bad examples of bad puukkohanding.
Someone said: 'All this is already said million times but it needs to be said again and again...'
1: Keep your puukko always sharp and clean. 2: Use and handle your puukko properly. 3. Keep and carry your puukko in right way.
Dull puukko (and knife too) is the second most dangerous thing in the world. (What is the most dangerous thing? (unloaded weapon)). You need only little force to use sharp puukko and if the 'shit hits the fan' the cut is clean, (hopefully) not so deep and will heal faster.
Since many of us eat or use the Puukko or Knife for eating it should be always clean. Specially the joint between the blade and handle. Sheat is the worst place to let bacteria settled.
Remembre the reason why you are useing your puukko. Learn technics for each work (woodcarving, skinning,ext.ext.) and the right ways to grip the handle.
Take the puukko out of it's sheat with two hands. Do not pull the puukko strait out from the sheat, but twist it a bit. This way puukko comes out nice and safely from often tight sheat.
Same thing when putting the puukko away. Look when you put it in. The sheat ('tuppi'

does not like if one cut's it. Often there is only one way to sheat the blade and this has to be respected. Blade saying 'Hi'! from 'guted' sheat is a sad sight...
Puukko is not a chissel, machette of axe, so do not use it in that way. It's not a screwdriver or bottle/can opener. Do not try to break or cut frozen food, bones, ice and such. The blade will suffer damages and you waste time honing.
Do not toy with puukko, if it falls do not try to catch it. No running with puukko in your hand. If you like your puukko do not throw it. It will brake sooner or later.
When not using the puukko keep it in it's sheat well oiled sharp and clean.
If you have to 'stab' with puukko, remember to put your thumb in the end of the handle as a stopper. There is no guard to stop your fingers slide to the blade. If you use puukko or any knife, you will cut yourself sooner or later. Learn from your mistake and remember, it becomes stupid mistake only if you do it twice...
I know that you guys already know all this s**t but if there is someone out there who doesn't... Well, I hope I didn't waste my breath. I just love Puukkos and making them and talking about them.
Cheers,