I currrently have four steps leading into my trailer home and I would like to replace them. There is a hard rail to the left but it is so worn I believe that I should replace this too. I would like to build them so that I can step out on to them when I open the door. I have search the internet to find instructions on how to build them yourself but I am confused. I would like to budget this project for about $100 if this is possible.