I have very deep veins and have a lot of trouble - even upcoming blood tests are leaving me worried.
Often I have been attended to by an emergency room doctor as they are very experienced in getting to the veins of people in all sorts of conditions and they are quite confident.
If chemo is on your schedule then just be guided by the people taking care of you - they will suggest a port if they think one would be better during your treatment.
All the best for your mastectomies and reconstruction.
Summer :-)