I think you can sold 2 pins at first, then the position of the chip will be fixed. for example, you can solder pin 1 and pin 8 for a soic 16 chip at first, then solder other pins.
I hand solder some sioc and tssop parts. I'd like to know a method to hold the part once I get it positioned so I can solder it. Not a permanent method, as the may need to be removed for repair.