My usual advice:
1) Ignore it as long as possible -- keep on doing every day stuff, eat, sleep, work, play. Do not time contractions -- this can be discouraging and nonproductive. Do not allow anyone to touch your vagina -- this can be distracting, inhibiting, and stressful, and can lead to dangerous interventions (AROM, sweeping of membranes) and cause infection.
2) If the labor drags on and you begin to lose energy: rest, eat, stay hydrated, and pee a lot. Have only people around that are comforting to you or entertaining, and flexible and sensitive to your needs. Make love with your husband and orgasm as much as you can.
3) When the contractions are demanding your attention, seek out a quiet, dark, warm, safe, private place. Have no one talk to you unless you initiate conversation or ask for verbal support. Do whatever feels good and right to you, whether that be getting into warm water, taking a shower, sitting on the toilet, taking a walk, meditating, getting a backrub, listening to music, walking, lying down, etc.
4) If the contractions get painful, try changing your position, walking around, submerging yourself in hot water, massage. If you have back labor, have someone put pressure on your sacrum (hard bone, small of back) or push in on your hips; direct them, tell them what helps and what doesn't. Vocalize, loudly, as much as you feel the urge to. Allow your body's involuntary actions to happen without trying to make them into something else. Move as much as feel the urge to (even during contractions.) Keep your perineum moist and warm.
5) Push only when you cannot help but push. Feel for your baby yourself. When you are automatically bearing down, get into a squat, kneel, or get on your hands and knees, whatever feels best. Your grunting and groaning will alert your attendants that the baby is coming and they will get into position to help you catch (if you do not want to do it alone.) Breathe. Let your body propel the baby out.
6) When the baby is out and it is clear that it is not in distress, the attendants should leave immediately and give you a chance to focus your bonding hormones on your baby and come out of "laborland" slowly and gently.
7) Eat and drink if you feel like it, and offer your breast to the baby (this will stimulate the oxytocin that will help your uterus continue contracting.) If the baby is not nursing, massaging your nipples and breasts will have a similar effect. After a while, squat briefly and push a bit to see if the placenta has detached, and when it does, catch it in your hands or in a bowl.
"Birthing from Within" has some good advice for how to approach labor. So does "Spiritual Midwifery".