[Dr_C2]

Yes - one option is to use solder paste, position the microchip and then heat with hot air - the microchip should self-align as the solder flows. The correct method is to apply the solder through a stencil using a tiny squeegee. The amateur alternative is to  drizzle the solder paste across all the landing pads and hope for the best as the paste is heated.

With the APB the issue is around access to the area of the PCB where the microchip is located - lots of tall components nearby. Also, lots of smaller smd components nearby that could become dislodged.

Yes - not so easy in this case as those you-tube videos might suggest IMO.

Hence my proposed (and tested) alternative method using the trusty old soldering iron.

c