Got'a have the breaker and rivet tool to do the job right.
I had to. I got the chain on sale, but it came with 120 links and I needed 114. I could have broken the new chain down with a hammer and drift, but why take a chance of messing up a hundred dollar chain. Plus the tool is high quality and will last several generations. And if anyone I know needs a chain put on, I can be a hero.