I'm just starting to get into running, and have just brought myself a pair of decent running trainers. They felt great in the shop, but having worn them around the house for a while I'm worried they're too tight. This may sound like a really stupid question, but how much room do you need for your toes to splay. What I mean is should there fell like there's loads of room in your trainers, or should you know that your trainers are 'there' if you know what I mean. I havne't really got access to a treadmill to try them out, and don't want to go out for a run and find that my feet are hurting because my shoes are too tight, and then can't take them back to the shop. Any advice?