I'll fix that in the post-processing, or?

Your background to video-production will give a clue to your answer. If you grow up with Photoshop and digital cameras, and apply the same thinking to video as with photo, your answer would probably be yes. When taking stills, you can fix a lot after the pictures was taken and och you can also take lot of shots.

Myself, I started photographing with a SLR and slide-film during the eighties. Before that, it was normal color-prints with compact cameras. We also had an old 8 mm film camera with projector.  Post-processing was more or less non-existant and cost of film was high, so you had to nail down your exposure and composition at once.

So then, what are my thoughts after one year with an HD videocamera and a professional grade NLE?

So far, I would like to share my learning in five different areas; Composition, Stability, Whitebalance, Sound and Hick-ups. Five areas where I believe that it differs between home videos and more professional productions.

 Example from post-processing an  event  in Final Cut Pro/X. 

Example from post-processing an event in Final Cut Pro/X. 

The first issue is with composition. If you did B/W in the old days, you more or less always cropped your prints a little. With new DSLR's you can crop even more without notice in quality. With video, the problem I had with different types of events, was that people are moving on stage, so you have to be very careful not to lose them out of sight, i.e. filming half a dancer or half a violin player.

If you cover a little bit more, then you can crop a little in post production, still having an acceptable quality. However, all your footage need to be in least full HD-format. For all other types of composition, you should get it right at once, due to the fact that you probably not can take a lot of different shots as with a digital camera. Re-taking film sequences takes time, even if the cost for digital film is near zero.

What about stability then? I have optical image stabilisation in the videocamera and there is digital image stabilisation in the NLE. I'm using Final Cut/X so it's rather simple to do it in post, but if we compare to the footage filmed with a proper videohead and a stable tripod, there is a notable difference. I would therefore say that you should use some kind of stabilizer, (tripod, monopod, steady-cam like etc) as much as possible, but sometime is it not possible or feasible to use a stabilizer depending on the location. 

White-balance is a little bit more problematic with video compared to still-photo. There are two issues to take into account as I see it. 1. The white-balance could differ during the shooting so that one clip have two or more different color-shifts. 2. The automatic white-balance differs between cameras if you are using multiple cameras. My recommendation, as a beginner in post-processing, is therefore to set manual white-balance an fix in post-processing.

My recommendations for sound are really simple. You have to do it right from the start. Post-processing sound if the recording isn't good enough is very hard. As a plan B, have two different sources for sound if anything should go wrong.

Hick-ups is when there are short moments of operator or actor errors. This is why you need multiple cameras and/or B-rolls. If you prepare for it when filming, then it's rather easy to fix in post processing. Just have enough of extra footage to select from. Here is one of the real benefits of digital compared to old film, the cost is very much lower today.

Finally, there is another aspect of post-processing video. It takes time and a lot of computing resources. Using a decent laptop, (I have a MacBook Pro from 2012 with extra memory and a SSD), transcoding an hour of video takes between 6-12 hours depending on what was done in post-postprocessing phase. Then, you also have to estimate the time to do corrections, clip by clip. 

So, my answer to the question "I'll fix that in post-processing, or" is two other questions. "Can it be done in post?" and "Do I have the time to do a lot of extensive post-processing?" Unless the answer is yes on both question, you better get it right from the beginning.