Healios

Hi. 
This may have already been covered at some point in the past but had my referral through this weekend they are recommending a full assessment via healios as they are rammed with cases and recent events.  
has anyone gone through this process before and was it a comfortable process? 
reading the letter my heart started going and felt nervous as it suddenly seems very real. 
I am going to do it as will confirm a lot for me. Any advice appreciated.