Based on recent threads, I thought this video (not mine) would be a great illustration of the difference between non-soldered crimps created by a variety of tools, and how achieving a quality crimp that rivals or exceeds a soldered connection is really a matter of using the right tool (in the right way) for the job.
If you insist on using the el cheapo combi-tool this guy uses first, then maybe keep that soldering iron handy. You'll need it
And the physical strength of the connection will still suck. (The guy seems to think the first crimp is 'OK'... it is NOT).
Or you can spend a few bucks extra - which you'll make up in short-order from time saved messing w/ solder & re-dos - & get a tool that will produce strong, solid, consistent connections with the ease of a squeeze. Heat shrink + that ratcheting crimper is beauty every time.