Only use snap traps, these are the most effective and humane available, i regulary have to get rid of mice, starlings, etc so i have good knowledge. Place the traps in corners with the bait end next to the wall, (mice like to run close to the wall). Also place some under cover and between things such as cabinets. Getting rid of mice can take up to a month, firstly seal off all entrances, they can get through holes a quarter of an inch thick, then place the traps. The most active times for the mice is around 10pm to 1am. Use baits such as peanut butter, chocolate spread, and raisins, currants and sultanas. Ggood luck!! hope i didnt come too late. Email is; iain @iainmaclean.freeserve.co.uk Tell me if you have success!!