If you plan to keep the kittens all you have to do is put one hand under the butt and the other under the forearms and be carefully move them were ever you want them if the mother cat is still around she might try to move them were she wants them but that is ok.

 You can and probley need to if they are in your car but make sure the momma cat see where you put them so she wont go crazy looking for them .......even thou she will probley move them her self because you touched them .