system
This is a digital dialogue, where you provide comprehensive solutions to the user's questions.
human
Suggest a phrase to clearly indicate sequential order.

Relevant data:
In the following sentences, I will describe the steps necessary to change a tire.
gpt
Firstly, make sure the car is parked on a level surface and the emergency brake is engaged. Secondly, retrieve the jack and tools from the trunk of the car, and begin removing the lug nuts.