<p>Dont understand the question. how does one define hard? </p>
<p>1) how hard it is to get into a program- if this is your questions it is impossible to answer because it depends on your target schools, your current field and its relevance to your field of interest and your stats. so without more information i dont think anyone can help you on this forum</p>
<p>2) the three you have mentioned are extremely challenging degrees at undergraduate level and many people only pursue a masters because they intend to do a PhD in the long run. you can find a great job with any of those degrees. Also it is recommended that you work for a year or two to see what interests you unless you know for a fact what you want to pursue in you masters. </p>
<p>3)what is your undergraduate major - not everyone can pursue an electrical engineering masters without a lot of the prerequisites. Mechanical and aerospace are fairly interchangeable but i know a friend who did engineering physics as an undergrad but did not get into any of the computer science programs he applied to for masters</p>
<p>again, you question is extremely ambiguous. if you are asking about the level of difficulty for a masters degree in terms of coursework and content, and you must hear it from someone then the answer is YES it is extremely difficult and challenging and it will beat you down till you cannot get up. BUT if youve been through an undergrad engineering degree then why worry?</p>