I'm a new member like you, thought I would reply as I have just been through a Right heart Cath for what looks like Constrictive pericarditis.
I will try to answer your questions, my cardiologist told me, they could access the neck or the groin, she went with groin for me as she said a lot of her patients dislike having their face covered, when using the neck site, I don't think one way is considered better then the other, more Dr's preference and yours. With the groin it was a longer stay as the leg/legs had to be kept straight in bed for a number of hours, but it was still a day case. I was told to take things pretty quietly for the first few days, no heavy lifting. Depending on the amount of bruising and bleeding under the skin, I was told could go back to activities/work within a few days to a week. You may feel a little sore and sorry around the cath site, but the actual procedure while not nice, is not too bad and they can give you something to help you relax. Just remember to ask! Hope this helps with some of your questions and best of luck to you. I have posted my story under the heart and cardiovascular forum, but please let me know of your progress.