Unfortunately, your DK links are taking me to the overall search page rather than the individual connectors. Could you post the connector part numbers?
As far as the ribbon connectors go, I think you're at least going to need some sort of crimping tool - something like what's shown at this Amazon link, for instance:
https://www.amazon.com/Wovier-Crimping-Fixture-Attachment-Connectors/dp/B01DKLO1M8/ref=sr_1_2?ie=UTF8&qid=1499665808&sr=8-2&keywords=idc+connector+pliers(if that doesn't work, search on IDC connector pliers)
Another option is a small arbor press and some metal blocks to spread the force out evenly, or perhaps a vise, but the biggest issue with a vise is the lack of feel - you could easily crush the connector accidentally. You will need some sort of tooling, as they're harder to press together than you might think.
The Molex connectors I've used are (replace XX in part number with number of pins, 02 to 20):
22-11-2XX2 - 0.1" pitch vertical locking header
22-12-2XX4 - 0.1" pitch right angle locking header
22-01-3XX7 - 0.1" pitch housing; polarized with locking ramp (useable with either straight or right angle 0.1" headers)
16-02-1125 - Terminal, crimp, 0.1" Molex, #22-#30 AWG
26-61-4XX0 - 0.156" pitch vertical locking header
26-61-5XX0 - 0.156" pitch right angle header
09-50-7XX3 - 0.156" pitch housing; polarized with locking ramp (useable with either straight or right angle 0.156" headers)
08-65-0115 - Terminal, crimp, 0.156" Molex, #18-#22 AWG
As for crimping the Molex terminals, you probably won't be able to effectively crimp them with a pair of pliers - they're pretty small. Ideally you'd do them with the manufacturer's 'official' crimper, which sets the wire depth and crimps both the contact and strain relief ears in one fell swoop, but they're like $300+. Molex makes a cheaper version (~$55 US at DK), part number 063811-1000 that requires two operations to crimp each terminal, and is not a ratcheting tool. As long as you're not doing a gazillion of them, that should work. It's likely that with some searching you might find an even less expensive 'universal' type too, but I can't come up with a suggestion off the top of my head.
-Pat