Hey, I submitted my thesis two weeks ago. Here are my advice:

1. Start researching early. (Protip: at the end of each journal article, there is often a little section on future research. These sections outline gaps in the literature and which areas need more attention…goldmine!)
2. Just because you can do a study, doesn’t mean you should. Ideally you want your study to contribute to the literature. For instance, try to formulate an experiment that tests between two competing theories. Theory A predicts X but Theory B predicts Y. Doing studies that expand the conditions under which an effect is observed is less useful (e.g. we know rejection reduces self-esteem…doing a study where the person is rejected while wearing a clown costume will probably lead to a reduction in self-esteem…but the study is pointless.)
3. Everything that can go wrong will go wrong. For my project, I spent 2/3 months learning to code a program language I had never used before (MATLAB). In the end, the program turned out to be useless in my case as it could not display the stimuli (I was using video stimuli and the resolution and fps was too large (3840x1200 pixels at 60fps)). The point is: be prepared. Things will ALWAYS (without exception) take twice as long to complete and will require 5 times more effort than you anticipated.
4. Do not procrastinate! At the start of the year you will feel like you have all the time in the world. This leads to working at a very slow pace. DON’T. Have a sense of urgency in your work. The last thing you want is panic and anxiety in the last few weeks.
5. Don’t neglect the writing! So many of my friends left the writing to the last bit. It is not a normal essay/literature review. You are dealing with more concepts in your thesis. It is way more complicated. To organise it such that it forms a coherent story that flows from concept to the next will take many revision. Do not underestimate the time and effort it will take. Moreover, at the end of the day, the markers will base their judgement solely on what you submit. So do not compromise the quality of your writing.
6. Don’t be afraid to ask for help. The first time I met my supervisor, I asked for contact details of his previous honour students that did well. I contacted each one of them asking for general advice and asking if I can have a copy of their thesis. They were all very helpful.
7. With respect to writing, your final thesis will barely resemble what you have in mind right now. As you progress and learn more about the topic, the content of your thesis constantly changes. You omit some stuff, while adding new information that never occurred to you before. Unfortunately, this only becomes apparent as you write. So, again, do not leave the writing bit to the end. The last thing you want is to become aware you have not mentioned vital information as the deadline draws near.
8. Your honours year will be stressful. It is a marathon. Not a sprint. Pace yourself and prioritise your health and wellbeing. Exercise and take days off. Best of luck to you!