Yeah unless they really did their homework and spent significant efforts building knowledge and conviction, starting on ATH might lead to panicking at the first significant drawdown. 

 They'll get it.....

...
 

 just have them get some and start getting comfortable with having a wallet somewhere? 

 he's more like here's a shit load of money and I want bitcoin. 

 well that IS rather awkward if you've got their fiat...

buy ⅓ of their stack now and sit on the rest 

 oh, no. I'm not and don't intend to be in the middle. We were just talking and he probably got "it". 

It's more about me being uncomfortable with the ATH enter. I'm afraid he could do something stupid like sell it when the price dips... 

 Just tell them to DCA 

 And what's the reasonable DCA strategy here?

Let's say you have $1m.

(AFAIK, statistically it's better to go all in). 

 But if you go all in you wont have the conviction to hold it to 300k 

 When I was in stonks, I DCAd but at some point I sopped and just went all in for an asset I liked.

My gains were much higher ... 

 Sorry I tossed a number without context, they need to hold against a 70% draw down 

 exactly. I believe he would.

Still it doesn't make me any more comfortable.

Orange pilling at 15k, that was much easier ... 

 Tell them it’s their money and to grow some balls and do whatever the fuck they want because you’re not their babysitter. 

 I'm the one who's uncomfortable :)

I need a pair too I guess 😂 

 Nobody knows where's the future ATH. Therefore DCA is really important. I started in bearmarket with bitcoin and dca really helped me. 

 sure, but we don't talk about dca. it's serious amount of czk shitcoin.

I know he can handle anything (we play poker a lot), but he could try to do something stupid like  take the "loss"