DONT preload, DONT freez and YES mix it all, buy a cheap 2$ steril vial and use that and KEEP IN FRIDGE! and use in 4-5 weeks, then toss and get more if you need to.
also i dont like longterm use of Human Chorionic Gonadotropin (HCG) on cycle, it may make things worse from over use (it may mess up your balls for good, from over use or extreme doses and cause a harder recovery/ desensitisation).
use it at the tail end of cycle to help post cycle therapy (pct). the last 4-5 weeks of cycle leading up to post cycle therapy (pct) but not in to post cycle therapy (pct) and like so: 500iu 2X a week.