Hey guys, I'm buying a set of SD Quater pounders and a Badass III soon for my 09' Fender American Standard P Bass.

I'm having a techie at my local music shop install the gear for me, but I'm just wondering - Is there anything I should be careful about once it's been modded?

Not that I've had any bad experiences, I just wanna be sure cos I love my bass to pieces

USA Fender Precision w/ Badass III + SD 1/4 pounders
MIM Fender Jazz
T21 SansAmp VT Bass
Gallien Krueger MB212
Nah, those are great upgrades. You could quite easily do them both yourself if you wanted to, unless you're really nervous.
Telecaster - SG - Jaguar
Princeton Reverb, Extra Reverb
P-Bass - Mustang Bass
Apogee Duet 2 - Ableton Suite
only thing about the bridge is you need a tech to file the slots in the saddles. the pickup swap is not very technical it requires soldering if your confident in your soldering abilities then you can do the pickups your self.
ESP B-405,Fender American Jazz Bass(EMG J active pups and LEO QUAN BADASS II ) squire P bass(EMG P active Pups)),
SansAmp Bass driver DI
Ampeg SvP PRO Tube Preamp
QSC2450 Power amp
Furman PL8
I put that pickup in my MIJ Fender P and LOVED it, I replaced EMG actives with it
RIP lowlife (fort wayne) the best crappy crusty punk band ever!