Hello,
Did you use a "one page checkout" ? If yes, maybe you can create a second page just for confirm order, something like :
Page 1: Guest 'login'/ Cart/ Shipping & Payment method etc
=> Ok button
Page 2 : Cart (only read)/ Terms and condition check / Finish butto
If you have already several checkout page, then can you provide your complete Checkout Workflow screenshot
=> From Main HikaShop Configuration, go to Checkout tab => Screenshot Checkout Workflow
part
Hope this will help us to progress on your subject.
Regards