Don't go on packages. There are many places. Make sure you cover all the important places. If you plan on your own, you can spend lot of time in a place where you want to spend a lot of time which is not possible in case of packages. Make sure you follow all the safety protocols. Happy Exploring.
I second all the people who said you can plan it yourself. I have been to Manali 2-3 times and it is one of the best hill stations. You can watch my complete video series here, I have covered almost all the places. https://www.tripoto.com/profile/akarshansapra