I never, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever, ever have a problem getting a charge.
Remember, a partial charge still goes toward your charge. You can get partial charges while assists hit or after Silver Chord. That, or just hit confirm into a combo ending in Silver Chord -> Liver Mortis sliding knockdown and take your time. Getting hit while charging lets you keep what you've charged as long as you didn't try to do the move.
You can also get a full charge after a Daisy Pusher and still manage to hit afterwards.