Can i fix this at home?

See a lot of them broke off. It is from not being able to get the rusty bolt out behind the heater hose nipple when disassembling. They get all the bolts out except that one and try to break the bolt by prying the housing off. But the bolt is usually stronger then the block. Steve also fills in stripped holes and re threads them. I noticed there an oil pan bolt welded in the block above .