Mistakes may cause sadness, regret, loss of confidence, etc.

Fear of making mistakes can be even worse to the degree that it may paralyze you from doing anything.

But, mistakes are just part of life. You are a human being and you live in this Dunya. Achieving perfection (mistake-less state) is impossible and shouldn’t be your goal. However, your goal should be growing with mistakes and in spites of mistakes.

“If you [people] are sinless, Allah will replace you with those who do sin, but will seek forgiveness.” – Sahih Muslim.
والذي نفسي بيده ! لو لم تذنبوا لذهب الله بكم ، ولجاء بقوم يذنبون ، فيستغفرون الله ، فيغفر لهم

So, try to minimize your mistakes by:

• Preparation & Planning (having a checklist)
• Rest before doing the task
• Focus when you do the task
• Check after doing the task and ask someone to check it
• Rely on Allah, if it worked fine attribute the success to Allah and if it had mistakes, just try again!