I used to attempt to groom my dogs myself. This is what always happened.
1) I really didn't have the proper height table so I used something in the garage or the floor. My back ached, the fur was everywhere. It was a big mess. I would have to have several extension cords which got tangled and were a pain.
2) I could not do a decent job. They always looked like poor step children who had haircuts behind the barn. I would get nervous and tired and just wanted to get it over with.
3) I went thru several sets of clippers. I always had to stop and oil the clippers cause they would get clogged and then I would get oil on the top.
4) The dog and I would be tired, grumpy and I would have dog hair all over me and my clothes, my shoes, in my hair and mouth.
50 I finally decided the groomers were trained, had the right equipment, had experience and certainly earned their money. I haven't tried to do it myself in about 10 years and my dog and I are grateful.