These are quite cheap to buy.
The TP-Link TD-W9970 N300 for about £35 or less (£29.99 at Argos). Very good value for money, and readily available locally, so easy to return if you are not happy with it.
There is a review here http://www.kitz.co.uk/routers/tplink_TD-W9970_review.htm
There is a quick setup wizard.
Broadband Username email@example.com
Even though you are not using a home hub
There is a quick setup wizard which you select the type of service you are using, and the login details. Just follow the prompts.
There is a emulator on this page which you can try.
Start with the "quick setup" page, and you can see what is required to set it up.