oh yes mess is best!!!
Why not give your lo a spoon to hold while your feeding, that way your lo can practice feeding herself at the same time as you feeding her. That way your guaranteed that it goes down the hatch rather than just over you or the floor. My lo's decided that she likes to blow raspberries everytime I try to feed her now! It can be funny (although I dont let her see me smirking), but can also be a pain. I have put down a big plastic sheet I got at mothercare now under her highchair, so that everything lands on that instead of the floor. Babies love to play with there food and its all part of their development. Feeling textures and lumps etc. After a while they tend to get bored of fiddling with it and eat properlly but if you prevent them learning then this can make feeding time hell.
xx Alison