windows A/C install

I need help installing my A/C unit in a medium sized room (151-300 sq. ft.). I have a custom window size, and I already have the unit. I am looking for a professional here on Freelancer who can come and install the A/C unit properly, with precision and accuracy. The existing installation is plywood, with a cutout. The opening is going to need 1 cut to make it higher for the new unit.