There are all kinds of ideas out there about using bed sheets and I have used many different type of sheets including high thread count and have had no problems with them at all. I use different types of needles on my machine and needles for hand sewing. Thin needles will go thru high thread count sheets. The other thing if you have a dull needle it makes it hard to poke the needle thru on any type of fabric. A dull needle "may damage" some threads but it won't make a hole that you have to worry about and it won't show. You can sew what you want sewing is sewing.