Bathroom cabinet put on wall

I am needing to replace a mirror cabinet in my bathroom, it is the same size as the one that has been taken down. The new one needs to go in exactly the same place as the old one as it's a tight fit with a light switch so precision is essential. I'm happy to help and hold up otherwise it will need 2 people. Shouldn't take longer than 10min for someone who knows what they're doing. Please only offer to do this if you have the skills and tools required for the job. Sooner the better