Urgent assistance with server admin required

Urgent assistance is required with some server admin. I have a server which is running close to the memory limits due to the software running on it (Ruby on Rails, MySQL etc) and I need someone who can show me how to identify and kill useless processes, and generally optimise the performance. Due to security issues I would not be able to allow direct access to the server, but would be able to act as a go-between and perform the commands required to do this job. Ideally I would like to do it between 1pm and 5pm UK Time today, but can arrange another time if necessary.