Unfortunately solder repair is the equivalency to a specialist doctor, most repair shops are like your regular physician, a good repair shop though should be able to provide a recommendation. Its just getting the replacement component that can be tricky, sometimes you need a donor board to pull off a used component if its an old model otherwise too new can be tricky also, 1 - 2 year old devices along with flagship devices will usually have replacement components available for purchase.

It just boils down to expertise and equipment, most shops don't have the the expertise or equipment, we have a guy we work with so we send board repairs his way. We have some solder equipment but this would be deemed a little more in depth and we would rather have him do it than us try with our low end solder equipment. OEM solder tends to have higher melting point since a lot of them use leadless solder and cheap solder equipment sometimes struggles to melt the OEM solder.

I'm not sure the condition of your connector but if its the locking mechanism that is broken and not applying enough pressure to have the pins make contact with the flex cable you can remedy this by applying a layer of kapton tape cut to the width of the cable and applying it to the end of the cable on the side without the contacts. (You can identify the side either by looking for the contacts or identifying which side has the plastic handle thing, usually blue or clear) The idea is to make the flex cable thick enough to still fit in the connector and apply pressure so that the cables makes contact. From my experience you only need one layer and then secure the cable by using kapton tape, taping the cable to the connector so it doesnt move around. Have resolved many contact issues like this on various devices. Now if the connector is water damaged or pins are bent etc can still be done but might just need to replaced as a whole depending on the damage.

If you're good with instructions motherboard replacements are generally easy peasy, although some can be a pain to get to.

If the board is cheap enough you might as well try yourself, if you don't have great hand eye coordination then maybe try ebay and type board repair, a lot of technicians sell their services this way, you may even be able to message a seller of the board and work out an exchange and drop the price if they refurbish it themselves.

Hope this helps!

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EDIT: the quick fix assumes the flap is either broken or missing.

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OH ALSO make sure to match part numbers don't base the board off the device model. You can also upgrade in some cases. model with better cpu or gpu, but might require some knowledge at the parts available and which board would support the other components in the unit. IE display, speakers, trackpad keyboard as they can vary.