I know you've got your HSTs cut already but I also like Lynn Wilder's method of 8 at a time. I did that with a Ladiesof the Lake quilt top I completed (still have to quilt). There were 700+ 2" HSTs and larger HSTs. Oversized, pressed well(very important), then trimmed to 2 1/2". Went together beautifully. I not have to pin for piecing together as the HSTs were perfect. Easy although time consuming. I'll try to link you to my tip with blue painters tape. Worked great. Also photo of quilt top as I was working on it.
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