Migrating from ASP.NET Membership Provider to WIF (with ADFS)

I have a ASP.NET WebForms application running on .NET v4.5. Currently it is using forms-based authentication using ASP.NET Membership.

I would like to migrate it to WIF to use claims from ADFS. Will it just be a case of updating the modules in the system.webServer directive of the web.config, adding in code to retrieve the claims from the ClaimsPrinicipal and removing the ASP.NET Membership pages (such as login forms, sign-up pages etc)?

Is it possible to migrate the application to use ADFS and WIF? If so, what amount of effort would be involved in something like this?