Agree on the tiller comments.
About the only comment I could offer is 'take your time' when working with hand tools, making a bow blank from a quarter split will take time and effort on your part. A bow isn't made in an evening or two. Oh, it can be, but likely won't be. Relax and take your time.
Cutting tools like drawknives are sharp and take your time when using them, keep them sharp, dull tools require more effort.
Take your time with the tillering process. A scrape here, a scrape there, five pulls on the string, look again, scrape a bit more...repeat as necessary.
While some are doubtless familiar with and competent with drawknives, rasps, scrapers etc when they decide to start making bows, more than a few of us haven't handled them since a shop class or hanging out in your grandad's shed when he was fixing up something around the homeplace.
There is a learning curve to learning proper and therefore efficient and safe use of drawknives, rasps and scrapers.
The learning curve includes multiple tries and fails, just look upon them as paying your dues to becoming a bowyer. If I recall correctly, I believe George Tsoukalas said he made and broke 14 or 15 bows until he a had a shooter. He stuck with it.
And that's my two cents.