Increasing my Stash

I decided I need to work on my two color knitting, so I got the yarn to knit the Manresa legwarmers. I don't know if I'll wear legwarmers, but the pattern seems good, and I want to practice fair isle knitting in the round. A lot of the colorwork I've done is uneven and puckered, and feels awkward, so I want to practice. I'm using Andean Treasure, which is super soft, and fairly cheap, so even if I rarely wear the legwarmers, it won't be a big deal. I've a little bit so far and already the pattern will have to be changed. The needles used are size 7 and that feels too loose to me, since it's a sportweight yarn.
I also got some Andean silk to finally use on Backyard Leaves, from Scarf Style. There are a lot of patterns from that book that I like, and I want to try one before the winter is over. Andean silk is definitely soft and seems like it'll be good for a scarf, but I don't know how well it blocks. It seems like a lot of people have used Andean silk for their Backyard Leaves, so it must work. I only blocked wool and one time, an unfortunate blocking of Wool Ease, where I ruined the scarf. Acrylic won't block, and it got really flat and stretched out, and thin. I don't know what I was thinking, but at least it was only a ribbed scarf.