1. Reach out MORE. You'll find that you have more things on your plate than in your 1st year, but you also will be more efficient then you were in your 1st year. Some of it depends on your program, but we started practicum in our 2nd year, so that offered a whole new area of stress, which was balanced by utlizing my supports. I didn't visit my family or friends much, but they came to see me a couple times a year (I lived near the beach, I'd visit me too.
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2. Remember Short-term v. Long-term. Don't get too stressed about short-term issues, and try to focus on your long-term goals. I am a low stress guy (I went through 3 hammocks in 5 years), but even I got stressed out about pending deadlines, getting A's in what I thought were "important" classes, and a host of other minutae.
3. 3rd, 4th, 5th year students should be on your speed dial. I made sure when I started my program to get to know people ahead of me, because it helped me not only plan better, but also understand what is a big deal and what is not. A 3rd year was the first to tell me, "B = Ph.D.". There is a natural focus on getting A's in everything, but honestly your GPA doesn't much matter (as long as you have >3.5, which is more A's than B's)
4. Pass on what you know to the 1st years. It is good karma, and it can also help you whether you know it or not. Being able to help others can offer a sense of mastery, which will help when something inevitably knocks your confidence during your practicum.
5. Breathe a sigh of relieve. The largest % of attrition happens in the 1st year. If you are starting your 2nd year, you are most likely going to finish your program, get your degree, etc.
6. Get ready for more work. 1st year usually isn't near the work that your next few years of training will require, but if you have a good foundation you'll be able to build on it. Later in my training I looked back at 1st year like a person looks back at undergrad now, "Wow....I really didn't have a care in the world back then (compared to now)."