Floor Paneling Replacement!

im going to replace the floor paneling in my 66 has anyone ever done it before and how hard is it! im also puttin in my dash sheet metal and probably gonna do some rewiring since i dont know how old mine is... anyone have any suggestions on the floor paneling/tips

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thats my girl

for my man gonzothegreat

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the color is dodge viper blue ive always wanted a viper as well haha but that wont happen and i remember seeing on at a car show... blue.. so i had the guys look up the color at my body shop and viola! 66 mustang dodge viper blue