the following tools are needed to install the Anderson 400 series would ride double hung insert replacement window safety glasses tape measure level small pry bar utility knife chisel power drill number two phillips bit three sixteenth inch drill bit putty knife caulk gun and sealant trim nailer table saw miter saw and reciprocating saw always follow the manufacturer's instructions for safe operation of all hand and power tools before beginning an exterior installation double-check
all measurements and make sure you have the unit specified for the job inspect each window unit for damaged or missing parts that could hold up installation when starting any tear out it's important to wear proper protective gear such as gloves and eye protection before removing any of the window sash you must first remove any exterior storm windows if present next remove the exterior stops by using a reciprocating saw and carefully cutting along the entire length
of the head and sighed jams use caution when operating the saw and make certain to use a proper length saw blade so you don't come in contact with the sash pulleys or damage the inside sash stops lower the upper sash and cut the sash cords remove the sash from the frame and dispose of properly next remove the parting stops using a small pry bar or stiff putty knife these will not be reused
so they can be disposed of properly cut the lower sash balance cords at each side remove the lower sash from the frame and properly dispose remove the pulley hardware from each side of the window frame open the weight pocket covers and remove the sash weights insulate the weight pockets and pulley openings with fiberglass insulation reapply the white pocket covers...
See more here: https://www.youtube.com/watch?v=o4dUitjzbN4