Lay out the bed in its final location. Remove any rocks or other objects from the area.
Check the air release valves around the bed and make sure they are closed. Look carefully, as some models feature multiple valves. Firmly shut any open valves.
Insert the air mattress plug into an electrical outlet. If an external air pump needs to be used, insert its plug into an outlet instead.
Connect the air pump to the intake valve if an air pump is being used.
Push and hold the appropriate button on the air mattress or air pump to inflate the bed. Continue until the bed is fully inflated, then let go of the button -- the timing varies depending on the type of pump and the size of the bed. Quickly remove the air pump and close the intake valve if necessary.
Lay down on the bed to check its firmness. If the blow-up bed came with an inflation control, use it to add or remove air and adjust the mattress to a comfortable setting.