Making decisions can be difficult. So, it all comes down to what you feel.
Explanation:
What I mean is, lets say you really wanted to buy this one special car. You could technically afford it, but you may have to take out some loans. Thats an example of a decision you can basically make on your own. Now a decision when you should get advice from someone is kinda a more complex situation. For example, lets say you were struggling with something and you didnt know what to do with yourself to get you out of this difficulty. Then thats pretty self-explanitory, you would ask for advice in that kind of a situation. Now I dont know what kind of a decision your making or if this is a question for homework, but this is honestly just my opinion soooo yeah. By the way if this didnt make any sence im deeply sorry.