Building deer fence

I searched online and tried to find a cheap way to build a deer fence. One video recommended to run 30lb fishline line by line (5 inch apart) along the T-post and said it woud do the trick. I thought this is a brilliant idea. I bought U-post (that is what store has) from the Homeport and fish line from the Canadian Tire. So neighbours saw me standing on the chair using my digging axe to hammer U-Post into the ground. It wasn't that hard. With about hour, I finished 5 of them. Running fish line along the post might take longer than hammering U-post. I will continue to work on this project for the rest of week.