Learn Power BI

Good Afternoon,

I am researching the viability of using Microsoft BI to produce Visual reports that summurise monthly financial claims and performance reports.

My questions are as follows;

1. How difficult it will be to learn how to acheive the tasks stated above? (time, tutorial resources etc).

2. Whether someone who is not familiar with BI, can alter the data in a excel spreadsheet to update BI reports, i.e they don't have to access BI at all.

Thanks in Advance

Gustav Bunge