1.)Which is your favourite brand of speciality thread?
Silk on linen. Silk on linen. I love stitching with silk on linen. Just feels good.
3)How many other brands of thread do you have in your stash?
Are you kidding? We're supposed to count?
DH would say too many.
4.) How do you store your threads?
Mine are bagged.
5.) How confident do you feel at substituting between thread types and colours compared to what the chart calls for?
Tremendously confident. Why follow directions when you can have so much fun on your own?