You don't need a repair man to stop the squeaks in a metal bed frame -- you just need resolve and the right tools. Metal bed frames begin to squeak when the hardware loosens and metal parts rub together. A lubricant might work for a while, but if you want to do the job right you must correct the cause of the problem. This task shouldn't take more than an hour and you'll get that hour back with a good squeak-less night of sleep.
Lift the mattress and box springs off the bed frame -- you will need someone to help you.
Remove all the nuts and bolts that hold the pieces of the bed frame together with a pair of crescent wrenches. Use a flathead or crosshead screwdriver to remove any screws.
Wrap the threads of each bolt and screw with white pipe-thread seal-tape.
Place plastic washers on the screws and bolts. Reinsert the screws and bolts back into the bed frame holes. Place another plastic washer on the end of each screw and then tighten the screws in their holes. Place a plastic washer on the end of each bolt, replace the nut, and tighten the nut and bolt with the crescent wrenches.
Replace the mattress and box springs.