PLA welding is not as scary as it sounds, most of the time I just take some CA glue and activator and hold some areas together
then I use either a crappy soldering iron (a $10 one off amazon).
Although when glueing the parts together if its a big part, say part of the chestplate, you can some superglue all across the areas (or whatever you're gonna use) where the parts will touch, line the parts up with your fingers (I suggest wearing some disposable gloves for this) and then with your other hand or have a friend/family member spray the activator on that specific area that you are holding
then switch to the other side and line it up there
Then the middle areas *should* be fine
*These tips are just from my experience so figure out what works for you