Led weaning!

If you BLW at what age did you start? My little one is 6 months and I slob feed her purees Twice a day along with formula throughout the day but I’m interested in starting to baby led wean however my baby doesn’t sit up completely on her own yet only a few seconds before falling over and I heard that your baby should sit up on their own confidently prior to BLW. She also has no teeth, I’m unsure if that has any effect on beginning or not. I’m very new to this and would like any information I can get as a beginner!