Not clear exactly what you are looking to accomplish "I want to have all permissions on both", but it seems to me the easiest way of doing this without a more complete explaination as to what problems you've encountered in your attempts, would be to create the same username with the same password (please use a password, Win7 does not respond well, to network access with blank passwords by default) make sure the user has administrative privledges on both computers.
Make sure both computers are in the same workgroup
Open the network and sharing center click the link to adjust advanced settings and make the appropriate adjustments to support what you are trying to accomplish.
If HomeGroups are causing a problem, simply unjoin / leave the HomeGroup...Workgroup sharing works well and has for a long time.