  We investigate possible search strategies for QCD-instanton induced processes
at HERA in the deep-inelastic scattering (DIS) regime. Our study is based on
the Monte Carlo generator QCDINS for instanton-induced events and the standard
generators for normal DIS events. It appears possible to isolate an instanton
enriched data sample via an optimized multi-dimensional cut scenario for a set
of six most instanton-sensitive DIS observables. As a further central point, we
investigate the stability of our results with respect to a variation of the
(hadronization) models available for the simulation of both normal DIS and
instanton-induced events. Dependencies on the variation of certain inherent
parameters are also studied. Within the ``bandwidth'' of variations considered,
we find that the normal DIS background is typically much more sensitive to
model variations than the I-induced signal.
