What I experience varies -- self-healing is different from working with another person; hands-on is different from distance healing, and each session has its own variations according to the issues involved.
As is true of many who work with healing energy, my hands tend to become quite warm, if not actually hot. My feet heat up as well, at times. Sometimes my entire body will heat to the point of sweating, but other times the heat remains just in my hands.
I feel the energy's vibrations, but not always on a physical level. It's hard to describe -- I'll feel vibrations in my hands, and often in various other parts of my body, but it's my energy body that's feeling them, first and foremost. At times the vibrations are so strong that I can physically feel them as well, but not always.
With other kinds of energy - the presence of a spirit being, fluctuations in the ambient energy - I often feel it physically first, which grabs my attention, and then I notice the vibrations in my energy body.
Not sure if that makes sense; it does to me, but I can't always tell if I'm getting my thoughts across. Words are so insufficient for spiritual discussions!
The greatest experiential differences, for me, are also difficult to put into words (especially succinctly), but I'll try: Sometimes when I'm working with healing energy in behalf of another person, 'I' - the human part of me - remain 'outside' of the process with little to no conscious awareness of the details, making myself available as a conduit for the energy while my greater self manages the connections.
Other times, I'm fully aware of the process; I sense the imbalances (illness, injury, etc) on many levels, seeing and feeling where the healing energy needs to be directed. I'll get images that provide information that helps me understand what the problem is, and often where it originated as well as how to focus the energy to assist in the healing. The images are sometimes symbolic, sometimes more literal. If the session is 'hands-on' (whether I directly touch the person or not), my hands will feel hot spots, vibrations, and sometimes cold spots as I work.
Because I function as a 'holistic healer', the information I get from these deeper sessions helps direct what kind of peripheral support I might offer -- information regarding herbal or vitamin supplements that can help support the healing, or perhaps counsel, or beneficial dietary adjustments, etc.
Lots of variations, but two things are consistent -- I never use my own personal energy; the healing energies I work with are gathered from outside of my self; and I never, ever take another person's energy into myself. Any energy that's removed is grounded to the Earth; once it leaves the body, the energy stops having any 'bad' or imbalanced qualities, so it's just absorbed back into the Earth.
What I personally experience, beyond perceptions, is a balancing of my own energy whenever I work with healing energy. Sometimes I laugh out loud, sometimes I cry; sometimes I just feel calm and focused, and I always feel better after a healing session than I did when I started.