I will share my experience with FE first:
1. It's not an easy exam because of the variety of questions you get on the test. Also, you will have lot of material to study.
2. Morning session is the same for everybody. Afternoon session can be general or specific as per your engineering discipline. Also, if you have been away from school for a long time, I would prefer you pick general in the afternoon as well which is what I did. If you pick general in the afternoon session, you might have to study little more compared to the the morning session other than discipline specific which requires lot more studying. If you pick discipline specific in the afternoon, it might be easier for PE exam but I did not think about PE when I was taking FE so I went with general both in the morning and afternoon session.
3. Morning session has 120 questions with 2 minutes for each question and the test is very timely oriented. Also, there are lot of questions which you can solve easily if you know how to use your calculator wisely i.e quadratic equations, matrices, vectors.... This is where you can score maximum in the test because most of the questions are very fundamental. If you ace the morning session, you are in for breeze in the afternoon session.
4. Afternoon session gives you 4 minutes for each question and the questions are little tough and can be tricky. In total there are 60 questions and based on my experience, there were several questions which I had no idea whatsoever but again you do not have to score 100%. Also, since I picked general for afternoon, I did not have much difficulty in understanding most of the questions, Since this is closed book test with only FE reference material provided in the test.
5. Make sure you know the FE reference material in and out. Go through it several times because for FE test, timing is very important and with the number of questions on the test, you dont want to spend too much time searching for information in the FE reference manual.
6. Most important of all, practise all the problems again and again till you have thorough understanding. Especially, if you have been out of school for very long, there are good chances that you might have forgotten lot of stuff which is why practising is the key. In my case, I was very weak at economics which is an important subject both in FE and PE but given the amount of time I spent on this, I can tell, I mastered engineering economics.
Let me know if you need any other information.