Will installing new parts mods disrupt the tech trees of in-progress career/science mode saves?

[IntellectualTortoise]

I'm considering installing some more parts mods on top of the few that I already have, but I'm hesitant because I don't want to break an ongoing career save. Will the new parts automatically go into the tech tree nodes of the save (meaning I will probably have some of them already unlocked) or will the tech tree break and make the save unplayable? Any advice/tips/warnings would be helpful!

[zer0Kerbal]

39 minutes ago, IntellectualTortoise said:

I'm considering installing some more parts mods on top of the few that I already have, but I'm hesitant because I don't want to break an ongoing career save. Will the new parts automatically go into the tech tree nodes of the save (meaning I will probably have some of them already unlocked) or will the tech tree break and make the save unplayable? Any advice/tips/warnings would be helpful!

my experience is that adding part mods is usually good, its removing them that can be tricky.

[DeadJohn]

1 hour ago, IntellectualTortoise said:

Any advice/tips/warnings would be helpful!

Always backup your entire KSP folder before adding or removing mods, so you can undo if things go wrong.

I've never had a tech tree problem adding a new parts mod as long as the modded tree directly supports the parts mod, or the tree and parts fully support everything in stock.