Got a picture of the light fixture?
Going to be a challange with Hardee siding.
Going to need to add a siding block.
I make my own out of vinyl lumber.
The siding block lets you mount the lamp so it sits level.
Its not a challenge at all.. if your not a newbie. NOT arguing against the other guy either. I done install them to often. Once you get the method its nothing to it! I will give this advice thou; use a whole saw cutter to properly/accurately cut the hole evenly. Then use a electric nm work repair box(if the wall your installing on is closed in on both exterior side of the wall..if you already have the wire already set for the new light).