Defroster unit went out

First let me remind you my husband is disabled so it was up to me to do the repair. I'm 70 yrs old. I first removed everything from freezer and then removed the back cover removimg 4 screws,then i removed the old defrost unit which held 2 screws replaced with the new one then i had to put cover back in place..then put everything back in freezer and so far its working...Only time will tell.But the part was so reasonable that if if i have to i will get another..but not for a while i'm hoping,