Starting a new job is always a little bit nerve-wracking. You want to make a good impression on your first day, and unfortunately, that can sometimes lead to people making some pretty big mistakes. Here are a few things you definitely should avoid doing on your first day (and really, your first week) of a new job.

1. Don’t be late

This one should be pretty obvious, but it’s worth repeating. Being late on your first day is a surefire way to make a bad impression. Not only does it show that you’re not particularly reliable, but it also sends the message that you don’t respect your new colleagues’ time. Try to arrive a few minutes early so you can settle in and be ready to start work on time.

2. Don’t take too long of a lunch break

Again, this is something that you should really avoid doing any day at work, but it’s especially important on your first day. Taking a long lunch break on your first day can make it seem like you’re not taking the job seriously. Of course, you need to take a break to eat, but try to keep it to a reasonable length.

3. Don’t dress inappropriately

This one might seem like a no-brainer, but you’d be surprised how many people make this mistake. When in doubt, err on the side of being too formal rather than too casual. You can always relax your dress code once you get to know your colleagues better, but on your first day, it’s best to dress up a bit.

4. Don’t gossip

Gossiping is definitely not something you should be doing at work, period. But on your first day, it’s especially important to avoid. You don’t want to be the person who’s known as the office gossip, so just steer clear of gossiping altogether.

5. Don’t be too friendly

Being friendly is great, but you don’t want to come on too strong on your first day. You don’t want to make anyone feel uncomfortable, so just take it easy and be yourself.

6. Don’t complain

Complaining about your previous job, your commute, or anything else is really not a good idea on your first day. It just makes you seem negative and like you’re not really excited about the new job.

7. Don’t be afraid to ask questions

This one might seem counterintuitive, but it’s actually really important. Asking questions shows that you’re interested and invested in the job, and it’s better to ask questions than to make mistakes.

8. Don’t forget to say please and thank you

This is just good manners, but it’s worth repeating. Remember to say please and thank you to your new colleagues, and you’ll definitely make a good impression.

Following these simple tips will help you avoid making any major mistakes on your first day (and really, your first week) of a new job. Just relax and be yourself, and you’ll do great.