When I moved my belongings from my former parental home to an apartment, I used a Penske 17' box van and made 2 trips to and from home. I asked my nephew and a couple of local friends to assist with loading/unloading. One friend brought his pickup and a flatbed trailer.
We piled stuff into the box van, the pickup truck and trailer and made one trip about 7 miles north. Everyone in our group helped unload and carry the boxed cartons and furniture into the apartment through the backdoor. We placed the furniture as near where we thought things would be positioned and then piled cartons stacked up into the bedroom, storage area, and living room and front hallway.
There was still more that needed to make the trip, so we bid the friend with the pickup/trailer goodbye, and my nephew and one other friend returned home to put more stuff into the box van. This time, we included my guitar gear, amps, and effects as well as other items that weren't stored in boxes, like lights, picture frames, table chairs, and other stuff.
The guitars were stored in their cases or gig bags, and then placed back into their cardboard shipping cartons from whence they were purchased. That, plus the amplifiers stored in amp covers (no need for repackaging amps if we were careful) made the 2nd trip and were carried off the box van ramp into the apartment.
From beginning to end, it took from 9:45 AM Jun 29th from when we picked up the van from the rental dealer, to 9 AM Jun 30th the next morning when the van was returned. All items that made the move were offloaded, positioned and/or stacked by 9:30 PM the previous evening. I returned home 10:15 PM the 29th and slept on an air mattress at home so the van could be returned directly from home to the rental dealer with a gas refill along the way.
My boss had given me a 4 week leave of absence from work to begin putting all of my belongings into cartons, then carrying the belonging into our adjoining garage where we staged the moving van 2-½ weeks later. The last 9 days of my leave of absence were dedicated to unpacking and locating places for my belongings in my apartment.
All told, had there been exactly 2 more large cardboard cartons, my apartment would not have been about to contain it all. There were only narrow walkways between the cartons while unpacking, and the empty cartons were returned home for my elderly Mom to use when she would eventually sell her house.
Regards guitar gear, you can purchase cardboard guitar / bass shipping cartons from Staples.com or ULine.com for guitars/basses that will provide modest protection during shipping for instruments. You'll need the correct measurements for a guitar carton, otherwise the search engine will return a load of results. Option is to try Uline's search engine, that was better than Staples. Due diligence is required with correct packaging to protect against having a guitar tossed about inside the carton.
Here's a link that can help:
https://www.uline.com/BL_7906/Guitar-Boxes?keywords=Guitar+Shipping+Box