OK here's where the extra tool cost comes into play. You will need a crimp tool for these terminals. However, as usual, I have located a very good value in an MC4 crimping tool. A pro who does this every day for a living would not use this tool because it is more tedious and time consuming than the more expensive pro-grade versions, but for the money this tool preforms very, very well.
I bought this MC4 die set and crimping frame from Pro's Kit and while their dies can be rather sloppy and inconsistent, & some dies absolutely abhorrent, their MC4 crimp die has been decent and remained fairly consistent.
Pro's Kit Lunar Series Crimp Frame (LINK)
Pro's Kit Lunar Series MC4 Die Set (LINK)
All together the crimp frame and die set will run you $51.52 a real steal for an MC4 crimp tool.