The only thing I can interject is you can buy cable cutters at Harbor Freight (I know they don't make the best tools, but for this purpose you can use them). You can buy a cable cutter much cheaper than you can buy a bolt cutter.
I used solder only as well but now put a dab of soldering paste on the exposed wires then crimp on the terminal. Finally heat the terminal with a torch (for larger gauge wires) and let the solder pull into the terminal through capillary action. Reason I do this is I've seen a positive wire overheat due to a loose connection and the solder melted right out of the terminal end. Had the positive wire fallen out free from it's terminal end and fell to a ground such as the engine block or frame, the result could have been catastrophic with an under hood fire.
Crimping a cable is preferable compared to using solder, in the past solder was used but it has been found that it migrates up the cable and creates a brittle spot which will lead to failure. A good crimp will never let loose and will conduct better, using adhesive lined shrink tube over the area will insure a sealed connection. In the photo of the newly crimped cable it shows the inner cable has a gap between the insulation and the lug, this is not acceptable and will lead to corrosion. Sometimes back yard procedures are less desirable.
You can buy super high quality custom cables online with same day turn around for less than a bolt cutter, why would you bother with something you may never need to make again. I ordered my 00 battery cables for a pos ground classic, the manufacturer shipped them same day, the total was less than bolt cutter at big box store