Your federal application will fall into one of three classes: not qualified, eligible, or eligible referred. Out of the eligible referred the organization will interview a select group of candidates. The interview is usually conducted as a research panel interview and they are behavioral based interview questions. They want you to provide an example of how you worked in the past, dealt with a difficult customer, or worked on a project with a colleague who was difficult. They want to know how you played in the sandbox with others in the organization because you are always working with others as a federal employee.
The private sector focuses on results and accomplishments. The focus of the federal resume is process/skills/(the how). The focus of the federal resume is on how you perform the work and also results and accomplishments. While human resources of the government want to see qualifications and skills for the position, the hiring managers want to see accomplishments also, so the resume has to pass screening factors at different levels of the organization. This is not the time to be conservative but answer the questions at the highest level and brag on the resume.
99.9% of federal jobs require 12 months experience in performing the work in order to qualify (12 months does not need to be consecutive) or transferable skills to a situation for 12 months. You can also use coursework to enhance your resume. Utilize school and school experiences/activities/courses, projects, etc., in the body of the resume to gain experience. That experience can help you qualify for the 12 months of experience. Some require more experience than that. How you leverage transferable skills is important. All of us have them but we may have to dig deep.