Well, yes, but few people can do it properly. See below.
When observing, beginners think of little else but where to enter and where to exit in order to make the greatest number of points, which defeats the purpose of the observation. Since they learn little if anything about price movement, their fears of losing money and of being wrong remain intact, and their subsequent efforts are for the most part a waste of time. If one can avoid thinking about the money and the trades, the observation phase can bear fruit rather quickly (there are, after all, only three directions price can take). Otherwise, it may never end.
There is the matter of indicators, however. And if one decides to go that route, the observation and testing can go on for years.
I got done with testing long ago, so coming up with new ideas is not an issue. The chief difficulty is not falling asleep.
These phases, by the way, originated with this:
www.traderslaboratory.com/forums/wyckoff-forum/15535-developing-plan-trading-journal.html. You may find it helpful if you're just beginning.