Honey Oil Syringes or Honey Oil + Delta 9 vape carts - from DistillateDirect

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Hi Expert vapers,

TL;DR- Should I buy Honey oil/ Delta 9 THC Distillate pre filled 510 thread carts OR the Oil Syringes? How to use the Oil syringes from DD?

Detailed Post - I am relatively new to vaping. I took to weed only 2-3 years back. Not much of a flower person. I find vaping extremely convenient. But I also believe this is coming with a price. My strain tolerance has gone too high as I was smoking up almost every other night. So (trying to) give a break of a few days in between.

Anyways, I have a battery which takes 510 thread carts. I started with Hooti carts which were garbage, finally settled with Distillate direct.
I ordered one big order of 5-6 carts and the slim heat pen last feb and almost all carts are nearing their end "now". So that's my average.

I also have a Youcan hive vape pen 2.0 which came with a refillable cartridge I guess. I have never used it.

So my question is - if one buys a syringe - how to use it? Do I directly pour it into the refillable cart of the youcan or must I mix something in it?

Will there be worries of leaks etc?

I am due to create my next big order from DD and confused if I should take a mix of their honey oil/ THC Distillate pre filled carts or shall I try to buy their syringes.
I tried searching on youtube etc but didn't get many hits.

Please advise.
cron