Before the meeting
Pick a neutral place that neither dog owns. A quiet park, a large fenced field, or a wide sidewalk works. Avoid your yard or house, since dogs may feel they have to protect it. Bring two adults if you can, one handler per dog, each person calm and able to move easily.
Plan to keep both dogs on leashes with plenty of slack. Tight leashes send a message of tension to the dog. Use a regular collar or harness, nothing that hurts if the dog pulls. Bring treats, and keep toys and chews at home, since they can start arguments.
Also check yourself. If either dog has a history of fights or a strong fear of other dogs, do not do this alone. Book a private lesson and let a trainer guide it.
Go in with a calm plan and a calm body. Dogs read tension through the leash and through your breathing. If you are nervous, practice the walk first with a friend and a calm dog you already know. Keep the mood light, talk in a quiet voice, and give yourself permission to end the session early.