Your respective numbers make you both strong-willed and somewhat stubborn people. It could often feel like there are two captains on your ship, whose conflicting viewpoints can lead to discomfort at best or explosive arguments at worst. A willingness to compromise is extremely important for your relationship. 

You both have good business instincts, which could result in successful shared endeavors (although ~first~ most likely has the greatest talent for managing financial affairs). Should you decide to work together, make sure to keep your responsibilities separated to avoid potential conflict. Whether in business or your personal life, you will need to have faith in each other's abilities and respect your independence. With both of you preferring to do things your own way, this may not be an easy task. Neither of you easily allow the other to dominate, nor do you feel comfortable as the other's subordinate. Keep in mind ~first~ has a need to see material results and reward, while ~second~ is more interested in the satisfaction that comes from a job well done. 

The fact that you are both quite sensitive behind your strong, self-reliant facade makes you vulnerable to being hurt by insensitive comments and arguments. Your keywords for a successful relationship are communication and compromise.

Although you probably take different approaches at times, you also have much in common; the 1 and the 8 are considered very compatible numbers. One positive aspect is your love of shared experiences. If you can be sensitive to the needs of your partner and communicate openly, you should be able to enjoy a rewarding relationship sharing the many interests you have in common.