The installation style often dictates the look and complexity of the project.
: Measure the length and width from the exterior structure of your current tub or the alcove opening.
: Measure the interior length and width at the widest points to ensure the "soakable" area meets your comfort needs.
Replacing a tub can be an approachable one-day DIY project with a helper if you are prepared. However, if you are changing the tub's footprint or moving plumbing (e.g., switching from an alcove to a freestanding tub), professional installation is highly recommended to ensure proper drainage and floor support. How to Choose a Bathtub - Lowe's