Company merger - bgp/ospf networks

Hello Community!
My company recently merged with a small service provider that runs BGP/OSPF within their AS. We run the same protocols internally as well. I'm looking for some direction in merging the two networks. As of now, we have to keep our IP assignments separate and treat each network as it's own entity. I would like to eventually merge the two networks so we have one AS. I'm hoping someone in the community has experience with this type of change and would be able to provide some help/direction. I'm sure redistribution will be used, but i don't know how to start or where??? Any basic guidelines to follow or config examples would be greatly appreciated.
Thank you

Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
Dealt with a company merger several years ago. Found VRF and double NAT useful tools. VRF allowed insertion of company's network onto acquired company's network infrastructure while still keeping them isolated. Double NAT allow communication between overlapping IP addresses during transition.

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Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
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