Before a bed bug exterminator starts the treatment:
Move your clothing and linens and wash them in hot water.
Move furniture away from the walls to allow the exterminator to reach the baseboards.
Clean your home right before the treatment to expose bed bugs.
Remove any loose items in the infected area to improve access to treatment area.
Remove animals and plants from treatment area.
Depending on the treatment, you might also have to pre-treat or bag your furniture. Talk to your exterminator about the steps you should take.