I've been having some issues stabilizing the needle once I get the flash. As a result, the flow of blood can be slow into the vacutainer, because the needle is hitting the walls of the vein, or it'll slip out completely. What are some tips about stabilzing? What I am doing currently is inserting the needle at about a 15 degree angle and STOPPING as soon as I see a flash (because I am afraid to puncture the posterior wall of the vein). Often times, this means only a quarter of the needle is under the skin. Should I try inserting BELOW the vein instead of on top of it, and pushing the needle all the way in until it is completely under the skin and the hub can rest on the skin? Should I not worry about puncturing the posterior wall of the vein, and pull the needle back until blood returns? Any tips would be appreciated. Thanks,.