My 2p worth.....
Given that most people as they start out will not be immediately clear about at what level they aspire to shoot. Remember that not everyone wants to shoot registered shoots and fill their cabinets with silverware.
Therefore, I am not sure there is a "one size fits all" approach that will lead to success in your own personal terms, if there was I'm pretty sure it would have been bottled by now. The answer to this question is, like many others on here, very much down to personal circumstances.
However, my guess would be that unless you're lucky to have a group of mates like IPS has, and if you want to compete at registered events, the odds are that a coach suited to your personal preferences, will move you on quicker than any number of well meaning mates (regardless of their age)
My central point being the approach needs to be "suited to your personal preferences" as the relationship between coach (or friend) and pupil; the style of coaching and the methods being taught, all need to chime along for it to work, for you.
So it follows that simply "going to a coach" may work, but it may not. Conversely, taking advice from a decent and experienced shooter may or may not work.
The only true way to know, is to have a go at both, and decide for yourself what works and what combination suits you best.