The sahaba used to make istikhara for so many things, even small items like a pair of shoes! They made istikhara for all matters big or small in life.
The Prophet (PBUH) would make the dua “Oh Allah if this thing is good for me, if this thing is better for me then give it”. Istikhara is one of the most powerful tools of a believer.
When you do istikhara, you are specifically asking Allah to guide you to the right path of your decision. If your decision is bad, Allah will take you away, and if it is good Allah will put it in your heart to go forward!