Ybnormal

I just received the new dash and will be installing this weekend. The new dash does not have the holes pre drilled for most of the components and I know some will need to be done before I install it (i.e. mounting clips and air deflectors and speakers). Has anyone done this and if so did you install the dash and then drill the holes for the speedo/tach, center and glove box or drill the holes before installation? Any words of wisdom before I try to tackle this? Thanks

YBnormal...drive a vette
www.angelfire.com/al/swhite7/interior.html