The steps that are necessary to max the skills you're seeking aren't a secret or rocket science. Put enough points into INT and interleave your fighter levels a little so that you end up the ranks you need when you get to your ending level.
If you know your target skill values, start with that number and begin subtracting from it the values that you can reasonably provide outside of skill ranks to reveal the gap that you must cover. For example, in order to find the trap panels in Epic Party Crashers, you must have a Search of 52. 51 won't reveal them, and 53 is wasted.
52 search minus
15 item (37 left)
4 Greater Heroism (33)
2 Head of Good Fortune (31)
6 Tier-3 INT skills green steel item (25)
3 +INT stat bonus from +6int item (22)
With that gear (not quickly gathered, but possible for a level 20 considering TR), you'd need to make up a gap of 22 skill points - easily done just by maxing ranks. You wouldn't even have to max ranks if you put some enhancement points into Search.
Of course, designing a build that just barely does what you want with no headroom at all puts you in a tough spot in the event that the Devs make anything you want to do "harder". Not likely to happen but worth mentioning.
Maxing any stat at character creation is expensive - are those 6 build points that you put into STR worth the +1 to-hit and damage that they bring? For some people they are.