I've ordered myself a nice long 3mm ball-nosed bit for a relief carving project I'm working on. The flutes are 25mm and the overall bit length is 75mm. Shank dia. is 3mm.

Can anyone offer me any advice regards using one?

The nice man where I bought the bit from has said I need to be careful with it but he is experienced in metalworking and obviously wood is more forgiving. I'm practising with bits of Pine that I have kicking about but intend to be cutting the design in Oak and other hard woods.