Removing Steps from Checkout

In the screenshot below there are three steps (1-3) that can be removed from the Checkout page

Billing Address

To remove Step 1 go to Configuration > Settings > Order Settings and tick the checkbox next to 'Skip Billing Address Step'. Note this will only remove the step from the customer's checkout page if there is already a Billing Address assigned to their account 

Shipping Address

To remove Step 2 go to the products you wish to apply this to in Catalogue > Products > Manage Products. Navigate to the product variant page through Product Variant > Edit, un-check Delivery Enabled. If this is for the entire storefront then apply this to all products

Delivery Method

To remove Step 3 go to Configuration > Settings > Order Settings and tick the checkbox next to 'Hide Shipping Options in One page checkout when there is no option'. DO NOT REMOVE EXISTING DELIVERY METHODS  Then go to Configuration > Delivery > Delivery Rate Computation Methods and ensure the active shipping method is Fixed Rate Shipping. Double check there is only one option by clicking on 'Configure' on the Fixed Rate Shipping entry.