I'm currently in bed watching Muppet videos on You Tube with my two. Have to venture out for our swimming lesson later - may take a Thermos flask with me!
Weaning is so much hassle I'm going to leave it as late as possible!
I can't remember when I started weaning DD1 but general guidance is that baby needs to be able to sit up with or without support. I think tongue control also improves around 6 months, making them less likely to poke food out on reflex.
Also, as babies get older, they are less likely to accept new tastes. Under 1, it can take 15 tries to accept a new food but far more as they grow. So make sure you introduce as many different flavours as possible, as early as possible.
DD1's SALT recommended holding the spoon side on to baby's mouth (like you drink soup) and then allowing them to take the food from the spoon, rather than placing the spoon into baby's mouth and "wiping" the food off as the spoon comes out. This doesn't teach them anything.