Hi..a stent will be placed within your coronary artery only when the artery is blocked in such a way that normal coronary circulation is not happening. So don't fret over it at all. It is a simple process with a very minor risk of complications. Once it's done. You will not feel any sensation of a stent being placed.. Your symptoms should get better. There are risks of stent, although they are minimal. Always risk/ benefit is kept in mind before placing the stent.