IT IS NOT VERY DIFFICULT, I CAN HELP.........THE SIZE OF THE RSJ WILL DEPEND UPON THE SIZE OF THE OPENING....IF IT IS SMALL OPENING LIKE 1 TO 1.2 METERS YOU MAY NOT NEED RSJ'S ALL YOU WILL NEED IS ONE OR TWO CONCRETE LINTELS. SIZE OF THE OPENING IS VERY IMPORTANT AND ALSO HOW MANY FLOORS ARE IN...