By the way, I tend to fit in this latter group, even though for sure I suggest that newbies do not even attempt to do what I am doing and that they first build up their BTC portfolio by ONLY focusing on ways to buy BTC (and if they sell any BTC, they replace it within a reasonable short period of time), so they are focusing on accumulation based on various ways of buying BTC until they might reach a decently large BTC stack size, then they might consider (if they want) to include some selling techniques within their BTC portfolio management strategies.
Any newbie investor had a lot of task to do and a long way to go when they are set for bitcoin investment, this is not what to just determined overnight and invested because you've got some financial opportunities to invest and hold, have we also consider that bitcoin is a digital currency which means that we are not expected to buy money, we rather exchange for it or earn it by different means, this could be one of the best ways we can be a good investor, how do we now invest also matters alot, but the road to this here now begins with learning, knowing the different investment plans and strategies, how we could reduce the cost of loss and maximize profits, how we can sell and be on the good advantage of such decision and many more ways we could adopt while trying to be a good bitcoin investor.
Of course, you have to decide these kinds of balances for yourself to the extent that you believe that you are going to be able to build your bitcoin investment (and the size of your overall investment portfolio) by engaging in selling rather than buying behaviors.
For sure, there could be strategies that end up working out well to sell some BTC (or even all of your BTC) on the way up, but there are a lot of prior BTC holders who became completely bitter because they sold their BTC at profits, but the BTC price continued to go up and either did not correct back below the previous sell price or it took a year or two before the BTC price corrected back below the prior BTC sell price which caused for a lot of frustration in terms of lost opportunities in terms of the higher BTC prices... including that sometimes if the BTC price is high for so long, the frustrated person ends up buying back in at higher prices, which is not necessarily a good strategy, even though it might seem like the more obvious strategy when a person ends up contributing to himself being a low coiner or a no coiner.
No one can tell you where to strike such balances, and my own personal philosophy is to really error on the side of buying and ongoingly buying, and maybe coming up with some kind of measure that you will not play around with selling until after your portfolio has reached 1 or 2x the size of your annual income.. yet of course, there might be other kinds of criteria or even some kinds of ways to approach selling in such a way that you are not really selling very many BTC, so that even if you sell some BTC on the way up, you are not selling high portions of your BTC holdings... and if you have not looked at Rpietila's (Risto's) 2013 thread, maybe you should?
(SSS) - A Sane and Simple bitcoin Savings plan