Obligatory: I love Solidworks!
Hello! So I'm a mechanical engineer that's been certified in Solidworks since 2017 and have graded college CAD classes on Solidworks for 2 semesters.
Couple initial questions about the final project I want to ask:
Do the sketches need to be fully defined?
Are there any specific features/mates that need to be included in the design?
Solidworks is definitely easiest to work with when trying to make machined/inorganic designs. This doesn't mean curved/organic shapes are impossible to make, they just require more mesh and surface tools. I'm not sure if those were covered in your class or not. If not, there should be guides on YouTube. Overall the difficulty will depend on the design of the helmet you pick.
Also if you need models for screws, fans, ect, look at the McMaster Carr website. They have free Solidworks files for everything they offer. This can be used to make sure you have the proper space for each component. Ask your professor or TA if these would count towards the 10 parts. If not, you can still use them to figure out the spacing and as a reference to then model in your own fans and screws.
