We went with Bliss guidelines of 5-7 months actual. Come 5 months actual my LO wasnt satisfied with milk alone, even after her 'dinner' then 'supper' feed she wasnt settling as well as she had been (and I ruled out everything else). She had regularly fed every 3 hours but bottles were starting to only satisfy her for less than this despite the fact she was taking all the milk her wee tummy could hold. It was a hard decision as developmentally she wasnt far enough on to show some of the 'signs' of being ready to wean so I had to go with the fact she was hungry!
I started very slowly with plain baby rice and made it a runnier consistency than it said on the box so it was just like a thicker milk fed with a spoon. Then I just followed what it appeared my LO was happy with. She is now 9 months actual and is a fantastic wee eater. Despite only being just short of 12lbs she eats loads. Dont get me wrong we have sometimes had to take a wee step backwards to go two forward but in the main we are getting there. We are hovering around stage 2 and she is coping better just having everything pretty thick and taking wee lumps of meat etc separately and chewing on them. She will eat home made lentil soup with lumpy veg and ham in etc. In fact just this week she has started grabbing the spoon and opening her mouth and trying to shove it in (with my assistance!), we just need to work on aim now!!! lol. She takes porridge and fruit for breakfast, a two course lunch and a two course dinner along with milk at waking, lunch, mid afternoon, dinner and supper. We have had to take solids out with us for quite a while now and if we didnt we would either be subject to major hungry tantrums or feeding her milk every couple of hours (i think the last time we missed a solids meal and only gave milk she lasted an hour and a half before she was starving again!) Goodness help us when she gets big!!! lol.
You know your baby the best, go with what feels right for you and your baby. x