I have found a hot air gun to be very helpfull when dealing with hose's that nead to be forced over larger barbs.
Warm up the hose to soften it, wet the barb with some water (to act as a bit of a lubricant) and give it your darndest to push the reluctant hose into place.
PS wear some gloves
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Don't worry what other people think, they don't do it very often.
Alfa 75 Potenziata
Supercharged AW11 MR2 (soon to be twincharged
)
RB20DET S13 Silvia