Go for it, arcane tricksters are pretty cool. if theres some problem with traps, summon some level 1 monsters and make them set the traps off. a wand of monster summoning 1 cl3 should do it
I'm playing an arcane trickster at our sessions right now and at level 12 (3 rog/5 wiz/4arc), the combination of magic and sneak attacks are, well, deadly

hasted and with Expert Tactician, dual wielding short swords he can make 5 attacks at +10/+10/+10/+10/+5, for a grand total of 25d6 with sneak attacks, and improved invisibility really helps to get you going.
Imp Invis, really helps when you cast spells too, lightning bolts and fireballs coming out of nowhere is a treat before closing in for sneak attacks.
for weapons be sure to get some spell-storing stuff and put either inflict or vampiric touch in them. i love being low on hp and unloading a 8d6 drain on opponents.
For items be sure to get cloak and boots of elvenkind, +10 to MS and Hide is not to be neglected.