Siver Soldering/Brazing

Hi this is my first post to this news group, my usual site is metalworking,
but in this case my problem is closer to jewellery so hopefully some one
here can help.
I have a sporran belt made of pierced sterling silver plates approx 1 mm
thick , 17 wide by 27 mm long. The plates are connected by 5 mm dia rings
soldered/brazed the ends of the plates and linked with solid rings 10 mm in
diameter.
One of the smaller rings has come adrift from the plate, due to a partial
solder /braze joint that failed probably when caught on something.
I know that I can take it to a jeweller for repair but being a hands - on
type I would like to try this myself.
How difficult is this repair? What solder and flux is required, and what is
a good source for material. What heat source is required?
Looking at the other plates on the belt I note at least 12 more rings that
do not have a complete fillet at the joint.
I have silver soldered other pieces in the model engineering and hobby
fields, but that was brass,copper, and steel, but never silver or this
small.
Any suggestions or help will be appreciated.
Ray