Can i pump breast milk by hand?

Yes: Yes, though it's a hassle and can get uncomfortable. If you're going to be pumping regularly, you probably want an electric pump.

Yes: Absolutely! i used the technique of manual expression for both of my children and it was awesome. Most people who hear this think the concept seems very strange, however i found hand expression to be more efficient for me than a breast pump. Check out this video from stanford on the technique: http://newborns.Stanford.Edu/breastfeeding/handexpression.Html.