This will take a couple of hours over several days.
Before treatment, dry comb using small sections. Get out as many live ones as possible and hopefully some of the eggs as well.
Use treatment leave on for the stated time.
Rinse and shampoo or whatever is recommended.
Mix 1 part white vinegar with 4 parts warm water, either pour over head or use in a spray bottle. The vinegar loosens the glue that holds the eggs to the hair shaft.
Towel dry and then comb again. Small sections.
Shampoo out and condition well.
The next day use vinegar solution again. Comb again, wash and condition very well.
Day three...repeat above
Day four...same again
Day 5... as above
Day 6...and again
Day 7 retreat using lotion and follow the above for the next 3 days.
As you have wash or put pillows, cases, sheets, soft toys, towels etc in a back bin bag for 48hrs. Vacuum the sofas and carpets within an inch of their lives. Wash coats or hoodies, fresh clean clothes daily in case a live one is on jumpers etc. (They can live up to two days off the head and won't reproduce away from the scalp)
Fingers crossed I have yet to experience this with my kids but I'm one of 5 and my parents went through hell and back ( so did us kids) through one summer.