Ditto. When I am doing a compound cut, I always start with it clamped. Why. Because I learned it here from the experts and Steve Good’s site. I always try to listen to the experts.
I made my clamp from Steve’s pattern and instructions. He posted a new pattern just this week for a compound cut and he has link to the clamp
https://scrollsawworkshop.blogspot.com/2020/09/compound-cut-tea-light-candle-stand.html
if you do a search on his blog, you will find lots of patterns and detailed posts on how to cut, use the clamp, etc. you can also do a search here as there have been several posts discussing best practices on cutting compound cut patterns. One in particular was a while back now that I started asking questions about blades to use. Lots of great info, provided by a lot of the folks here that helped me a lot.