I am new and need input on my plant, to trim or not to trim

I'm on week 5 of my first grow and I'm not bullshitting about it when I said I am new to growing and I am just getting nervous about the fact I have a plant doing good but definitely needs attention and I don't wanna overlaod with nutes or food or trim away and possibly hurt it so here it is and be nice. I haven't used any nutrients or fertilizers at all and I know that not good but I have some Miracle-Gro 1-1-1 plant food liquid easy pump and some Alaskan fish emulsion 5-1-1 and it's in soil that I got from a friend who grows. Also it's in a growbox with 3×40w U-shaped soft white fluorescent tubes sorry I'm not using all the expensive stuff but money is tight please help

I'd go easy on trimming right now,you could clean up the very bottom a little but I'd be doing more fan tucking and training now. But that's me

I'd also throw the miracle grow out and use the emulsion now but that's me too