Bitcoin investments is a very promising investment which although seems to be of long term returns.most persons are not patient enough to wait till the value of Bitcoins rise significantly .
Soo in general how much should one invest in Bitcoin should it be "how much you can easily invest without stress " or "as much as you can invest at all cost"
I do not understand what do you mean by an effort to invest in bitcoin ?
If you have extra money, you may invest in bitcoin for long term and if you do not have capital then, you should first raise capital and then invest in bitcoin. Buying Bitcoin from kitchen money or taking a loan is not the right way to invest in Bitcoin.
Although I am aware it isn't a do or die affair
Don't consider bitcoin investment as a do or die thing, otherwise, you will fall into FOMO and may invest all in at one point. Doing DCA is a very good method if you want to get into bitcoin at different prices.