Hello, and welcome to Rootschat!
I must admit I have never heard of that occupation before, so I've been browsing the old newspapers for silver chasers, and hopefully the following tidbits help to get a sense of the trade.
There were ads wanting apprentices as well as journeymen. The lowest age I saw for starting an apprenticeship was a "full 14". Some ads seem to be specific, in "knowledge of drawing essential", or "good with hollow ware". Some wanted a silver chaser as well as an embosser, so apparently two distinct trades, although I did run across a few fellows that did both.
There were numerous ads for tools of their trade; one ad was specific in tools for silver and metal chasers, for "matting, freezing punches, and his own speciality of white grain punches in round, square and oval dots" as well as chasers' regular punches. There was the occasional ad for estate sales of chasers, and the number of chaser tools seemed to be somewhat consistently around 200. (That's a lot of punches, and who knows what else!)
In 1924 there was an article lamenting the decline in silver and gold chasers. Apparently too many had gone to America as there had been no chasers there, and the big companies in New York were skirting the immigration system to get them there. This article mentions how a journeyman could make a good wage (referring to the UK) working for someone, and even more if they worked for themselves. The article said that at any one time, there was never more than 200 chasers in London.