You may not need to do anything else. Additionally, having your tires inflated properly is important for getting accurate reads on the measurements you'll be taking later.
[header] How to fix the alignment on a car [title] Check your tire pressure. [step] Your tires should be appropriately and evenly inflated before you proceed. [substeps] Tires that are not properly inflated may actually be the cause of your performance issues, so it's a good idea to check this first.