My biggest tip is make sure your child is really ready - dry for long stretches during the day, and at night.
Also - verbal enough and aware enough to tell you she needs to pee.
Willing and excited and looking forward to being a dry pants girl.
When you get started, practice with a doll. Doll gets a drink, and a few minutes later, the doll tells you she needs to pee. You say, 'We need to leave our game and hurry to the loo!' and you hurry there, take off doll's underpants, sit her on the loo, make a peeing sound, and then wipe and flush and congratulate the doll on keeping her pants dry. High fives for the doll should be part of the practice. Practice a lot, using the script. Then work on poo.
If the LO is willing to join in, let her.
When it's well and truly her turn, stay home. Do not leave the house for any reason for at least three days. Spend these days training and getting in constant practice.
Dress LO in underpants and a top. Give plenty to drink, so she gets a lot of practice all day every day. Have her help you mop up any little accidents, put wet undies in the washing machine, etc.
Remind occasionally to check if her undies are still dry. High five if so. No big deal if not.
I'd advise to not turn back once you start - line the bed with thick towels and don't put on nighttime nappies. Don't offer a drink within two hours of bedtime.
If there are interested relatives, they can be phoned to relate the news that LO is a dry pants girl once the new habit has been established.