How big a hole?
If you need/want a nice clean round hole, you can rent a diamond holesaw rig, or even phone around and ask how much someone would do it for?
You might find a lot of guys real slow on the work front with the equipment and time on their hands who would do it, say after work, or on a weekend real cheap
DIY way, can you get at both sides of the wall? If so, drill a single hole in the middle of the large hole you want to make, then on both sides mark out the circle you want to make your large hole, working from both sides usually much easier and you do not need to buy such long drill bits, bonus! Then with a hammer and chisel, knock the center of the hole out.
Is this wall a bearing wall?
If it is, you might want someone with knowledge of such things to look at the idea, you might need to add some kind of a header over the hole (depending on how big it is again....???), just trying to think of various things that could pop up.
Good luck, darn dirty job for sure, wear hearing protection and safety glasses, if not a full shield, flying rocks hurt...
The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.
William Arthur Ward