A question of Quantities {knitting}

Last week I did not get a chance to show you the middle twist of Nord, but here it is:twists and the start of the v-neck shaping. Isn't it amazing?

I have never knitted v-neck shaping before so that's interesting and fun - and hopefully will make me knit this up a bit faster. 

My real problem now is that I may be running out of yarn. I have found my spare skein BUT that skein was awful and split in zillions of places (I complained to the Knitting shop - no response and now they don't sell it!), and I had left out that skein on purpose... But it will be handy (and very annoying) in the end. 

This is the actual colour - the previous picture was edited on IG

Running out of yarn is not something that usually happens - because I am usually generous with the number of skein I buy - usually one more than I think I will need, in case all the UK (and French) retailers run out of the specific yarn (yes this is happening right now with Cascade eco Alpaca!). How much yarn do you buy for a project? The exact amount or more? 

Linking up to Ginny's today and interested in your thoughts.