Dear Parisi32 in Norfolk:
It may be possible to get your saline breast implants deflated a little if you think they are too big. It depends on your current fill volume, the fill range of your current implants and the amount of volume reduction you are looking for. Small adjustments, about 10% implant volume reduction, are possible if the implant is starting out filled to it's maximum allowed volume, and the volume is reduced to the lowest allowed volume. This will maintain your warranty and minimize the risk of implant failure. It should be performed under sterile technique, and personally, I only perform direct manipulation of breast implants in an accredited surgical facility so the sterility of the implant is maintained.
If larger reduction is needed, the implants would need to be replaced with new, smaller breast implants. Decreasing the fill volume below the manufacturers recommended minimum will increase the risk of deflation in the future, and technically violates your warranty should any problems develop in the future.