Changing a bandage after surgery is not difficult.
Then follow the step-by-step instructions on how to properly change bandages after surgery covered here.
Consider reviewing proper hand-washing techniques before you begin.

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This protects both of you.
Put on a clean pair of sterile gloves after washing your hands.
This can minimize pain and is gentler on the tender area surrounding the incision.
While it doesnt provide as strong a seal, it may be less irritating.
If you are wearing gloves, dispose of them once you’re done.
Put on new gloves once you’re done washing (if needed).
Clean the Incision
Cleaning your incision can be done with soap and water.
This can be done in the shower or at a sink.
You do not have to use antibacterial soap.
Pat the incision dry or allow it to air dry.
Do not scrub the area,remove scabs, or attempt to clean thesuturesor staples.
An incision may be red, but it should become less so as it heals.
It should also be “well approximated,” meaning that the sides join together neatly without gaps.
It should not look as though it isbeginning to pull apart.
At this time, check for any blood,pus, or other fluid draining from the incision.
If you are wearing gloves, throw them away once you are done with this step.
This is especially important if an incision is showing any signs of infection.
If you are assisting someone, put on a new pair of gloves before moving on.
If a surgeon has prescribed any special ointments or treatments, this is the time to apply them.
Do not use any lotions, powders, or cleansers that have not been approved by your healthcare team.
launch the sterile bandage and place it directly on the incision.
If possible, avoid setting the bandage on another surface like the sink or a table.
This will help prevent contaminating the dressings.
Position the bandage over the incision with at least a half inch of extra bandage on each side.
Tape all four sides to seal it in place.
You may need to use a few extra pieces of tape if the bandage is thick.
This is also true if you have asurgical drainin place.
Dispose of Old Bandage Properly
Throw away the old bandage.
Pets can be drawn to soiled bandages.
Do not flush bandages; it could clog the plumbing.
Once you’re done, throw away your gloves if you are wearing any.
Summary
Changing your bandages after surgery is an important part of the healing process.
It’s important to do it properly so that avoid infection.
MedlinePlus.Surgical wound care - closed.
Smith SM, Zirwas MJ.Nonallergic reactions to medical tapes.Dermatitis.
J Am Acad Dermatol.
2011;64(3 Suppl):S23-9.