Both my DDs started solids between 5 and 6 months. I say "started solids" and not "I started them on solids" because they both helped themselves by lunging at my plate and stealing food. IMO, best way for baby to start. They were of course showing all the common "signs" of readiness, and had been playing with sippy cups, water bottles, utensils, even hard food items for several weeks before. DS on the other had we did start offering solids to sometime btwn 6 and 7 months. He was (is) naturally more cautious and wasn't showing any interest in starting himself, so I started offering him some when I offered his twin sister. None of my kids ate more than tokens until much much closer to a year, and solids weren't the majority of any of their diets until closer to 2 years.
I don't completely agree w/ the PP that an interest in food isn't a sign of readiness. I believe it is, but I also think that what is often considered "interest in food" is really baby starting to notice what we're doing. That "hey, Mom's at it again with those shiny things" and this is a perfect time to start including baby at mealtimes, giving them implements to play with, even letting them sit at the table if they can. But when my child is sitting on my lap watching every single bite going into my mouth, and I can't keep their hands out of my plate, that tells me the child is ready to start experimenting. I don't watch the clock for nursing, don't watch the calendar for weaning, and the same for starting solids. There's nothing magic that happens at 6 months, no switch gets flipped in the GI tract that suddenly makes it ready. Some children's GI tracts mature faster, others slower; some are more observant and want to participate sooner or later. . .
We did BLW with DD2, and to some extent with the twins, although I did some spoon feeding, prepared some baby foods for them, mashed things up, even fed horrible rice cereal a few times (which they refused after the first time or two - they were smarter than I was, LOL). DD1 refused anything mushy and would only finger-feed herself, so I guess she was de facto BLW. We didn't worry about "meals" for a long time; with the twins, feeding and cleanup was so messy and time-consuming that I wasn't in any particular hurry to make it a 3-5x a day part of the routine. With DD2 and BLW, we just let her take whatever we were eating if she was interested. She was probably only eating once or twice a day until she gave up her 2nd nap (which all mine did early, sigh) because she was often asleep when I was eating.
If I was to change anything, I would worry way less about when to start, what to offer, how much to offer. . . and just relax about the whole think. It was much easier, less stressful, even less messy w/ DD2 who just got whatever the rest of us were having. None were ever anemic, despite C-sec birth w/ the twins & immediate cord cutting, some of them are adventurous and eat lots of foods, one only eats about 12 foods, all nursed forever. It honestly doesn't seem like it made any difference at all. If we had a history of food allergies or GI illness, I'd probably be more cautious, but we don't.