htr core '86 chev silvrado

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i want to replace heater core in the garage. this is our only vehicle and the store is 8 miles away. what problems should i look forward to,what,beside the obvious core and extra hose, parts should i have, special tools,etc. this is the one repair that is new territory so i can use any and all sugestions....accept the "put on another coat and get over it" one. thanks...frozinwisc!