I really think that you should ask the physician who has offered to perform the procedure what his usual risk and complications are, because this procedure is very operator dependent. It is unlikely to improve your life expectancy, but will improve symptoms if the valve is narrow enough and you have significant symptoms which limit your ability to exert yourself to your usual level of activity. If you are not limited, then this is not likely to improve your symptoms.
Now it does have significant risks, the most common and dangerous being embolic events to brain (i.e. strokes ) or to the extremities. It also has a risk of causing irreversible mitral regurgitation which may require open heart surgery to repair.
In my experience we usually wait until the onset of symptoms ( at least mild in nature) which in patients with rheumatic disease is about 20 years later than your own age is.
Can you explain what these symptoms are that are mild in nature? Also is it best to have it done before one plan on having a baby?
Tiffany