Hi, Hanzosmom.  Good question.  Combination procedures such as liposuction of arms/thighs and tummy tuck can be safely and are routinely performed together in a single surgery.  For me, the limiting factor to protect patient safety in combination procedures is your general health and ability to handle a large surgery, the total amount of anesthesia time, and the amount of planned liposuction.  Assuming you are healthy, surgery will be under 6 hours, and total volume removed in liposuction is less than 4 liters, this should be safe to perform.  The benefit of combining the procedures is that it will be cheaper since you are paying for less time in the operating room, and your recovery is coincident for both procedures.  In any patient undergoing this amount of surgery, the most important thing you can do to help yourself is to walk early and often after surgery.  This will keep the blood from pooling in your legs and causing a vein clot.  If you are going to split the surgeries, I would recommend doing the tummy tuck first since this will result in the biggest change, and the surgeon can then match your arms, legs, hips, thighs to your new tummy and create a better and more natural appearing body shape.