The mentality of 'just say yes and then figure out the details later' is a popular one among entrepreneurs and other risk-takers. It is based on the idea that it is better to take action and learn from your mistakes than to overthink everything and never take any action at all.

There are a few benefits to adopting this mentality. First, it can help you to seize opportunities that you might otherwise miss. If you are always waiting for everything to be perfect before you take action, you will never get anything done. Second, it can help you to learn and grow faster. When you are forced to figure things out as you go, you are forced to think on your feet and come up with creative solutions. This can help you to develop your problem-solving skills and become more resourceful.

However, there are also some risks associated with adopting this mentality. First, it can lead to making impulsive decisions that you later regret. If you are not careful, you can end up taking on more than you can handle or making commitments that you cannot keep. Second, it can lead to stress and anxiety. When you are constantly feeling like you are behind the eight ball, it can be difficult to relax and enjoy life.

Ultimately, whether or not the mentality of 'just say yes and then figure out the details later' is right for you depends on your individual personality and risk tolerance. If you are someone who is always up for a challenge and you don't mind a little bit of stress, then this mentality can be a great way to achieve your goals. However, if you are someone who prefers to have everything planned out in advance, then this mentality may not be the best fit for you.

Here are some tips for adopting the mentality of 'just say yes and then figure out the details later' in a safe and effective way:

• Only say yes to things that you are genuinely interested in and that you believe you can achieve. 
• Do your research before you commit to anything. Even if you are adopting the mentality of 'just say yes', it is still important to do your research before you make any major decisions.
• Be prepared to work hard. Adopting the mentality of 'Just say yes'  does not mean that you can expect everything to be easy.
• Be flexible. Things don't always go according to plan.
• Celebrate your successes. When you achieve a goal, take some time to celebrate your success. This will help you to stay motivated and to keep moving forward.

The mentality of 'Just say yes and then figure out the details later' can be a powerful tool for achieving your goals. However, it is important to use it wisely and to be prepared for the challenges that it may bring.