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When working with heater hoses, be extremely careful because the barb/nipple on the heater core can be very brittle due to age, and they can break easily. If they break, you will have to replace the heater core (involves dropping the dash and disassembling the front half of the interior), or seal up the connection some other way.
When removing the hoses, it is best to use a hose remover (looks like pliers with rubber on the ends), or if you're not re-using the hoses, just cut them and carefully peel them off. Don't twist with pliers or you may break the nipples.
When installing new hoses, you can dab a drop of oil on the nipple to help the new hose slide on. Use high-quality hose clamps, and be absolutely sure not to overtighten!
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