Well it depends really … I have a good friend that is a developer that is supposed to help me with my game … but he is going through some personal issues at home, so he needs to focus on that. So for development at the moment, I am on my own and although I can bounce ideas off him, I use the forums when I can and mostly develop the game on my own.
I have another friend who is a SFX guy professionally and has learnt VFX, so he is constantly tweaking things and sending me new SFX or VFX. Without him I would have to rely on pre-bought assets … which will never sound half as good as his, so in this instance I am not alone although I rely on him solely for the SFX and VFX.
I then have a freelance temporary resource who does some modelling and texturing for me, he is only part-time and delivers when he can, so most of my art is either bought or made by me where possible.
So I would say I am alone for most of the core development but I have help with the other areas. I am however able to prioritise my time and make sure I spend the required time I need to every week to meet my internal deadlines. Mostly I use the forums for help or try to find tutorials or assets that may help me with a problem. Answer Hub is also a huge help when I get stumped with some things or I think I have found a bug.