My veins are usually pretty easy to find.. apart from the time I had to have an intravenous dye for a scan just after my daughter was born.
One nurse tried & failed to get the vein, a 2nd nurse got the vein but it leaked so they called out the head guy who managed to inject the dye via my ankle without a mark!
They did say I may get a discoloured bruise there later.... they weren't kidding.. it was practically from my wrist to halfway to my armpit!
It was a good job that the outfit I'd chosen for my post baby first night a couple of days later didn't clash with it