I have started exclusively expressing since Sunday and am managing to keep milk production ahead of my LO's needs by expressing every 4 hours as he feeds. Until yesterday I was using a manual pump which was OK but took forever and gave me hand ache. I am now using a hospital grade electric pump which is quicker but have started to get sore nipples afterwards. Will this wear off after a few days of getting used to it or I am doing something wrong? Any advice or tips on expressing which may help would be really helpful.